[TG7100C][BL602] Amysen YX-WS01 Smart Plug Teardown
Amysen YX-WS01, FCC ID 2AOT8-WS01, module YX-X3-T71C-VER03, chip TG7100C (a clone of the BL602)
I purchased these in Nov 2022 via Amazon.com in the US, hoping that they'd be Cloud-Cuttable, but was quickly discouraged after opening one up - the chipset was neither ESP8266 nor BK7321... and I did try to get it to go into AP mode, but no joy there. Upon closer examination, I found the chip on the Wifi module was labeled "TG7100C".
(Note that at least five different vendors (Esicoo, Ecoey, Amysen, Tuya, Unbranded, etc.) have sold smart plugs labeled YX-WS01, but both the firmware and chipset has changed over the years. The original version was easily convertible to Tasmota and/or Tuya, then some lockdowns due to firmware changes, and then came chipset change(s).
After some digging [ https://twitter.com/madushan1000/status/1367041198851035137 ] it seems that the TG7100C is just a clone of the BL602. Evidence is in the SDK [ https://github.com/Ai-Thinker-Open/Ai-Thinker...vice_tree/chip_factory_params_IoTKitA_24M.dts ], for instance.
In order to flash it, I had to do a teardown and solder/connect it via UART/serial, Bouffalo Labs flasher.
==========================================================
After removing module, connecting it via Bouffalo Lab Dev Cube w/ FTDI USB adapter:
Flashing the removed module worked fine, and here is a template for it:
I purchased these in Nov 2022 via Amazon.com in the US, hoping that they'd be Cloud-Cuttable, but was quickly discouraged after opening one up - the chipset was neither ESP8266 nor BK7321... and I did try to get it to go into AP mode, but no joy there. Upon closer examination, I found the chip on the Wifi module was labeled "TG7100C".
(Note that at least five different vendors (Esicoo, Ecoey, Amysen, Tuya, Unbranded, etc.) have sold smart plugs labeled YX-WS01, but both the firmware and chipset has changed over the years. The original version was easily convertible to Tasmota and/or Tuya, then some lockdowns due to firmware changes, and then came chipset change(s).
After some digging [ https://twitter.com/madushan1000/status/1367041198851035137 ] it seems that the TG7100C is just a clone of the BL602. Evidence is in the SDK [ https://github.com/Ai-Thinker-Open/Ai-Thinker...vice_tree/chip_factory_params_IoTKitA_24M.dts ], for instance.
/dts-v1/;
/include/ "bl602_base.dtsi";
// version: 17
// last_comp_version: 16
// boot_cpuid_phys: 0x0
/ {
model = "bl bl602 IOT board";
compatible = "bl,bl602-sample", "bl,bl602-common";
#address-cells = <0x1>;
#size-cells = <0x1>;
gpio {
#address-cells = <1>;
#size-cells = <1>;
max_num = <40>;
gpio0 {
status = "okay";
pin = <5>;
feature = "led";
active = "Hi"; //Hi or Lo
mode = "blink"; //blink or hearbeat
time = <100>; //duration for this mode
};
gpio1 {
status = "disable";
pin = <6>;
feature = "led";
active = "Hi"; //Hi or Lo
mode = "blink"; //blink or hearbeat
time = <100>; //duration for this mode
};
gpio2 {
status = "okay";
pin = <2>;
feature = "button";
active = "Hi";
mode = "multipress";
button {
debounce = <10>;
short_press_ms {
start = <100>;
end = <3000>;
kevent = <2>;
};
long_press_ms {
start = <6000>;
end = <10000>;
kevent = <3>;
};
longlong_press_ms {
start = <15000>;
kevent = <4>;
};
trig_level = "Hi";
};
hbn_use = "disable";
};
};
i2s {
#address-cells = <1>;
#size-cells = <1>;
i2s@40017000 {
status = "okay";
compatible = "bl602_i2s";
reg = <0x40017000 0x100>;
mclk_only = "okay";
pin {
mclk = <11>;
};
};
i2s@40017100 {
status = "okay";
compatible = "bl602_i2s";
reg = <0x40017100 0x100>;
mclk_only = "disable";
pin {
bclk = <12>;
fs = <29>;
do = <30>;
di = <31>;
};
};
};
i2c {
#address-cells = <1>;
#size-cells = <1>;
i2c@40011000 {
status = "okay";
compatible = "bl602_i2c";
reg = <0x40011000 0x100>;
pin {
scl = <32>;
sda = <13>;
};
devices {
list_addr = <0x18 0x21>;
list_driver = "i2c_es8311", "i2c_gc0308>";
};
};
i2c@40011100 {
status = "disable";
compatible = "bl602_i2c";
reg = <0x40011100 0x100>;
pin {
/*empty here*/
};
};
};
timer {
#address-cells = <1>;
#size-cells = <1>;
timer@40014000 {
status = "disable";
compatible = "bl602_timer";
reg = <0x40014000 0x100>;
};
timer@40014100 {
status = "disable";
compatible = "bl602_timer";
reg = <0x40014100 0x100>;
};
};
pwm {
#address-cells = <1>;
#size-cells = <1>;
pwm@4000A420 {
status = "okay";
compatible = "bl602_pwm";
reg = <0x4000A420 0x20>;
path = "/dev/pwm0";
id = <0>;
pin = <0>;
freq = <800000>;
duty = <50>;
};
pwm@4000A440 {
status = "disable";
reg = <0x4000A440 0x20>;
path = "/dev/pwm1";
id = <1>;
pin = <1>;
freq = <5000>;
duty = <50>;
};
pwm@4000A460 {
status = "disable";
reg = <0x4000A460 0x20>;
path = "/dev/pwm2";
id = <2>;
pin = <2>;
freq = <5000>;
duty = <50>;
};
pwm@4000A480 {
status = "disable";
reg = <0x4000A480 0x20>;
path = "/dev/pwm3";
id = <3>;
pin = <3>;
freq = <5000>;
duty = <50>;
};
pwm@4000A4A0 {
status = "disable";
reg = <0x4000A4A0 0x20>;
path = "/dev/pwm4";
id = <4>;
pin = <4>;
freq = <5000>;
duty = <50>;
};
};
ir {
#address-cells = <1>;
#size-cells = <1>;
ctrltype = <0>;
tx {
status = "disable";
pin = <11>; // only support 11
mode = "NEC"; // NEC,ExtenedNEC,RC5,SWM
interval = <100>; // ms
active_mode = "Hi"; //Hi,Lo
};
rx {
status = "okay";
pin = <12>; // only support 12 13
mode = "NEC"; // NEC,ExtenedNEC,RC5,SWM
active_mode = "Hi"; //Hi,Lo
data_check = <2>; //bit 0:check cmd, bit 1:check addr
};
};
uart {
#address-cells = <1>;
#size-cells = <1>;
uart@4000A000 {
status = "okay";
id = <0>;
compatible = "bl602_uart";
path = "/dev/ttyS0";
baudrate = <2000000>;
pin {
rx = <7>;
tx = <16>;
};
buf_size {
rx_size = <512>;
tx_size = <512>;
};
feature {
tx = "okay";
rx = "okay";
cts = "disable";
rts = "disable";
};
};
uart@4000A100 {
status = "okay";
id = <1>;
compatible = "bl602_uart";
path = "/dev/ttyS1";
baudrate = <115200>;
pin {
rx = <3>;
tx = <4>;
};
buf_size {
rx_size = <512>;
tx_size = <512>;
};
feature {
tx = "okay";
rx = "okay";
cts = "disable";
rts = "disable";
};
};
};
spi {
#address-cells = <1>;
#size-cells = <1>;
spi@4000F000 {
status = "okay"; /* okay disable */
mode = "master";
reg = <0x4000F000 0x100>; /* 4KB */
path = "/dev/spi0";
port = <0>;
polar_phase = <1>; /* 0,1,2,3 */
freq = <6000000>;
pin {
clk = <3>;
cs = <2>;
mosi = <1>;
miso = <0>;
};
dma_cfg {
tx_dma_ch = <2>;
rx_dma_ch = <3>;
};
};
};
gpip {
#address-cells = <1>;
#size-cells = <1>;
adc_key {
status = "disable";
pin = <9>;
interrupt = <3>;
key_vol = <0 100 400 300 500>;
key_pcb = "SW1", "SW2", "SW3", "SW4","SW5";
key_event = "Usr1", "Usr2", "Start", "Up", "Down";
key_raw = <1 2 3 4 5>;
};
};
qspi {
#address-cells = <1>;
#size-cells = <1>;
qspi@4000A000 {
status = "disable";
reg = <0x4000A000 0x1000>;/* 4KB */
};
};
wifi {
#address-cells = <1>;
#size-cells = <1>;
region {
country_code = <86>;
};
mac {
mode = "MBF";
sta_mac_addr = [C8 43 57 82 73 40];
ap_mac_addr = [C8 43 57 82 73 02];
};
sta {
ssid = "yourssid";
pwd = "yourapssword";
auto_connect_enable = <0>;
};
ap {
ssid = "bl_test_005";
pwd = "12345678";
ap_channel = <11>;
auto_chan_detect = "disable";
};
brd_rf {
xtal_mode = "MF";
xtal = <36 36 0 60 60>;
/*
pwr_table = < 4 3 3 186
4 3 4 176
4 3 5 167
3 3 0 159
3 3 1 149
3 3 2 140
3 3 3 129
3 3 4 119
3 3 5 110
2 3 0 101
2 3 1 91
2 3 2 82
2 3 3 72
2 3 4 62
2 3 5 52
1 3 3 10>;
*/
pwr_mode = "bf";//B: only use power offset in EFUSE; b: use power offset in EFUSE with incremental mode; F: only use power offset in Flash; f: use power offset in Flash with incremental mode
pwr_table_11b = <20 20 20 18>;//1Mbps 2Mbps 5.5Mbps 11Mbps
pwr_table_11g = <18 18 18 18 18 18 14 14>; //6Mbps 9Mbps 12Mbps 18MBps 24Mbps 36Mbps 48Mbps 54Mbps
pwr_table_11n = <18 18 18 18 18 16 14 14>; //MCS0 MCS1 MCS2 MCS3 MCS4 MCS5 MCS6 MCS7
pwr_offset = <10 10 10 10 10 10 10 10 10 10 10 10 10 10>;//due to the limit of current DTC, negative value is used. So we work around by adding all the poweroffset with 10. so 8 represents -2; 10 represents 0; 13 represents 3
};
rf_temp {
en_tcal = <0>;
linear_or_follow = <1>;
Tchannels = <2412 2427 2442 2457 2472>;
Tchannel_os = <180 168 163 160 157>;
Tchannel_os_low = <199 186 170 165 160>;
Troom_os = <255>;
//negative value is NOT supported. So we use '256' for 0, '255' for -1, '257' for 1,'511' for 256
};
};
bluetooth {
#address-cells = <1>;
#size-cells = <1>;
brd_rf {
pwr_table_ble = <13>; //range:-3~15dbm; if set -3, please set 253 here
};
};
};In order to flash it, I had to do a teardown and solder/connect it via UART/serial, Bouffalo Labs flasher.
==========================================================
After removing module, connecting it via Bouffalo Lab Dev Cube w/ FTDI USB adapter:
[00:14:07.525] - serial type is general
[00:14:07.580] - Open COM3 Success
[00:14:14.238] - start-----------hal
[00:14:14.242] - [MTD] >>>>>> Hanlde info Dump >>>>>>
[00:14:14.245] - name PARAM2
[00:14:14.247] - id 0
[00:14:14.250] - offset 001fc000(2080768)
[00:14:14.253] - size 00002000(8Kbytes)
[00:14:14.256] - xip_addr 00000000
[00:14:14.259] - [MTD] <<<<<< Hanlde info End <<<<<<
[00:14:14.261] - Read slot:0
[00:14:14.264] - No written slot found
[00:14:14.266] - [BL] [SEC] TRNG Handler
[00:14:14.310] - 1th channel,lo_vco_freq_cw=146
[00:14:14.312] - 2th channel,lo_vco_freq_cw=145
[00:14:14.315] - 3th channel,lo_vco_freq_cw=144
[00:14:14.319] - 4th channel,lo_vco_freq_cw=142
[00:14:14.322] - 5th channel,lo_vco_freq_cw=141
[00:14:14.324] - 6th channel,lo_vco_freq_cw=140
[00:14:14.327] - 7th channel,lo_vco_freq_cw=139
[00:14:14.330] - 8th channel,lo_vco_freq_cw=138
[00:14:14.333] - 9th channel,lo_vco_freq_cw=136
[00:14:14.336] - 10th channel,lo_vco_freq_cw=135
[00:14:14.338] - 11th channel,lo_vco_freq_cw=134
[00:14:14.345] - 12th channel,lo_vco_freq_cw=133
[00:14:14.347] - 13th channel,lo_vco_freq_cw=132
[00:14:14.352] - 14th channel,lo_vco_freq_cw=130
[00:14:14.355] - 15th channel,lo_vco_freq_cw=129
[00:14:14.359] - 16th channel,lo_vco_freq_cw=128
[00:14:14.363] - 17th channel,lo_vco_freq_cw=127
[00:14:14.366] - 18th channel,lo_vco_freq_cw=126
[00:14:14.369] - 19th channel,lo_vco_freq_cw=124
[00:14:14.374] - 20th channel,lo_vco_freq_cw=123
[00:14:14.377] - 21th channel,lo_vco_freq_cw=122
[00:14:14.381] - 0th channel,vco_idac_cw=10
[00:14:14.383] - 1th channel,vco_idac_cw=10
[00:14:14.386] - 2th channel,vco_idac_cw=10
[00:14:14.391] - 3th channel,vco_idac_cw=9
[00:14:14.393] - 4th channel,vco_idac_cw=9
[00:14:14.395] - 5th channel,vco_idac_cw=9
[00:14:14.399] - 6th channel,vco_idac_cw=9
[00:14:14.402] - 7th channel,vco_idac_cw=9
[00:14:14.404] - 8th channel,vco_idac_cw=9
[00:14:14.409] - 9th channel,vco_idac_cw=9
[00:14:14.411] - 10th channel,vco_idac_cw=9
[00:14:14.415] - 11th channel,vco_idac_cw=9
[00:14:14.417] - 12th channel,vco_idac_cw=9
[00:14:14.420] - 13th channel,vco_idac_cw=9
[00:14:14.425] - 14th channel,vco_idac_cw=9
[00:14:14.426] - 15th channel,vco_idac_cw=9
[00:14:14.430] - 16th channel,vco_idac_cw=7
[00:14:14.433] - 17th channel,vco_idac_cw=7
[00:14:14.435] - 18th channel,vco_idac_cw=9
[00:14:14.440] - 19th channel,vco_idac_cw=8
[00:14:14.442] - 20th channel,vco_idac_cw=8
[00:14:14.444] - LO locked 9 135
[00:14:14.447] - rosdac_i_gc3=25
[00:14:14.449] - rosdac_i_gc2=25
[00:14:14.451] - rosdac_i_gc1=25
[00:14:14.456] - rosdac_i_gc0=25
[00:14:14.457] - rosdac_q_gc3=36
[00:14:14.458] - rosdac_q_gc2=36
[00:14:14.460] - rosdac_q_gc1=36
[00:14:14.464] - rosdac_q_gc0=36
[00:14:14.468] - rbb_cap1_fc_i=26,rbb_cap2_fc_i=26,rbb_cap1_fc_q=26,rbb_cap2_fc_q=26
[00:14:14.475] - new rbb_cap1_fc_i=50,rbb_cap2_fc_i=50,rbb_cap1_fc_q=50,rbb_cap2_fc_q=50
[00:14:14.477] - LO locked 9 135
[00:14:14.481] - amp=128,step=32,adc_mean_i=40
[00:14:14.483] - amp=160,step=16,adc_mean_i=61
[00:14:14.485] - amp=176,step=8,adc_mean_i=72
[00:14:14.490] - amp=184,step=4,adc_mean_i=77
[00:14:14.492] - amp=188,step=2,adc_mean_i=80
[00:14:14.495] - amp=190,step=1,adc_mean_i=82
[00:14:14.500] - amp=191,step=0,adc_mean_i=82
[00:14:14.504] - tmx_cs=0, tmxcs_pwr_avg=27251, tmxcs_pwr_avg>>10=26
[00:14:14.509] - tmx_cs=1, tmxcs_pwr_avg=35585, tmxcs_pwr_avg>>10=34
[00:14:14.513] - tmx_cs=2, tmxcs_pwr_avg=46982, tmxcs_pwr_avg>>10=45
[00:14:14.519] - tmx_cs=3, tmxcs_pwr_avg=60930, tmxcs_pwr_avg>>10=59
[00:14:14.523] - tmx_cs=4, tmxcs_pwr_avg=76030, tmxcs_pwr_avg>>10=74
[00:14:14.527] - tmx_cs=5, tmxcs_pwr_avg=83497, tmxcs_pwr_avg>>10=81
[00:14:14.533] - tmx_cs=6, tmxcs_pwr_avg=78475, tmxcs_pwr_avg>>10=76
[00:14:14.536] - tmx_cs=7, tmxcs_pwr_avg=64380, tmxcs_pwr_avg>>10=62
[00:14:14.543] - tmx_cs_max=5, tmxcs_pwr_max=83497, tmxcs_pwr_max>>10=81
[00:14:14.546] - amp=256,step=64,adc_mean_i=-165
[00:14:14.550] - amp=320,step=32,adc_mean_i=-72
[00:14:14.553] - amp=352,step=16,adc_mean_i=-21
[00:14:14.555] - amp=368,step=8,adc_mean_i=2
[00:14:14.557] - amp=376,step=4,adc_mean_i=15
[00:14:14.563] - amp=380,step=2,adc_mean_i=22
[00:14:14.564] - amp=382,step=1,adc_mean_i=23
[00:14:14.566] - amp=383,step=0,adc_mean_i=27
[00:14:14.572] - tosdac_i=28,tosdac_q=38,tx_iq_gain_comp=1013,tx_iq_phase_comp=-6
[00:14:14.575] - amp=256,step=64,adc_mean_i=31
[00:14:14.578] - amp=320,step=32,adc_mean_i=91
[00:14:14.583] - amp=352,step=16,adc_mean_i=123
[00:14:14.586] - amp=368,step=8,adc_mean_i=141
[00:14:14.588] - amp=376,step=4,adc_mean_i=149
[00:14:14.591] - amp=380,step=2,adc_mean_i=153
[00:14:14.597] - amp=382,step=1,adc_mean_i=156
[00:14:14.599] - amp=383,step=0,adc_mean_i=156
[00:14:14.606] - tosdac_i=29,tosdac_q=39,tx_iq_gain_comp=1016,tx_iq_phase_comp=-2
[00:14:14.610] - amp=256,step=64,adc_mean_i=87
[00:14:14.614] - amp=320,step=32,adc_mean_i=130
[00:14:14.616] - amp=352,step=16,adc_mean_i=154
[00:14:14.621] - amp=368,step=8,adc_mean_i=166
[00:14:14.624] - amp=376,step=4,adc_mean_i=172
[00:14:14.626] - amp=380,step=2,adc_mean_i=176
[00:14:14.632] - amp=382,step=1,adc_mean_i=177
[00:14:14.635] - amp=383,step=0,adc_mean_i=178
[00:14:14.642] - tosdac_i=25,tosdac_q=44,tx_iq_gain_comp=1004,tx_iq_phase_comp=3
[00:14:14.645] - amp=272,step=68,adc_mean_i=40
[00:14:14.649] - amp=340,step=34,adc_mean_i=137
[00:14:14.651] - amp=374,step=17,adc_mean_i=190
[00:14:14.656] - amp=391,step=8,adc_mean_i=218
[00:14:14.661] - tosdac_i=24,tosdac_q=40,tx_iq_gain_comp=1004,tx_iq_phase_comp=-1
[00:14:14.665] - amp=224,step=56,adc_mean_i=132
[00:14:14.667] - amp=280,step=28,adc_mean_i=195
[00:14:14.672] - tosdac_i=23,tosdac_q=37,tx_iq_gain_comp=1000,tx_iq_phase_comp=6
[00:14:14.677] - amp=272,step=68,adc_mean_i=140
[00:14:14.679] - amp=340,step=34,adc_mean_i=205
[00:14:14.682] - tosdac_i=20,tosdac_q=37,tx_iq_gain_comp=990,tx_iq_phase_comp=4
[00:14:14.688] - amp=288,step=72,adc_mean_i=130
[00:14:14.692] - amp=360,step=36,adc_mean_i=191
[00:14:14.695] - amp=396,step=18,adc_mean_i=223
[00:14:14.699] - tosdac_i=28,tosdac_q=42,tx_iq_gain_comp=992,tx_iq_phase_comp=-1
[00:14:14.705] - amp=304,step=76,adc_mean_i=142
[00:14:14.708] - amp=380,step=38,adc_mean_i=208
[00:14:14.714] - tosdac_i=29,tosdac_q=40,tx_iq_gain_comp=994,tx_iq_phase_comp=5
[00:14:14.718] - [WF] [KEY] [CFG] nVAP is 2, endidx 10, startidx 8
[00:14:14.725] - ------ set default key 4201cf08, key ptr 00000000
[00:14:14.728] - ------ set default key 4201d2e0, key ptr 00000000
[00:14:14.729] - td_init
[00:14:14.733] - td_reset idx=0
[00:14:14.738] - td_reset idx=1
[00:14:14.742] - [WF] country code CN used, num of channel 13
[00:14:14.743] - Enable BMX IRQ
[00:14:14.751] - [WF] [KEY] [CFG] nVAP is 2, endidx 10, startidx 8
[00:14:14.756] - ------ set default key 4201cf08, key ptr 00000000
[00:14:14.759] - ------ set default key 4201d2e0, key ptr 00000000
[00:14:14.760] - td_init
[00:14:14.761] - td_reset idx=0
[00:14:14.762] - td_reset idx=1
[00:14:14.771] - [WF] country code CN used, num of channel 13
[00:14:14.772] - wifi init success!!
[00:14:14.773] - [000311] kv version:1.0
[00:14:14.779] - [000312] aos framework init.
[00:14:14.781] - -Welcome to AliOS Things-
[00:14:14.784] - [prt] log level set as: [ 3 ]
[00:14:14.791] - --------Firmware info--------
[00:14:14.794] - app: smart_outlet, board: tg7100cevb
[00:14:14.795] - Host: feige
[00:14:14.796] - Branch:
[00:14:14.797] - Hash:
[00:14:14.805] - Date: Aug 5 2021 14:53:55
[00:14:14.807] - Kernel: AOS-R-1.3.4
[00:14:14.809] - LinkKit: 2.3.0_FY_1.6.6-8
[00:14:14.814] - APP: app-1.6.6-20210805.145355
[00:14:14.816] - Region env: SINGAPORE-ONLINE
[00:14:14.822] - [MTD] >>>>>> Hanlde info Dump >>>>>>
[00:14:14.824] - name media
[00:14:14.825] - id 0
[00:14:14.830] - offset 001c5000(1855488)
[00:14:14.832] - size 00002000(8Kbytes)
[00:14:14.835] - xip_addr 231b4000
[00:14:14.840] - [MTD] <<<<<< Hanlde info End <<<<<<
[00:14:14.843] - version = ver0.0.1
[00:14:14.846] - KV = ProductKey:a1JG8An8ORa
[00:14:14.849] - KV = DeviceName:703e971ed91c
[00:14:14.852] - [000333] pk[a1JG8An8ORa]
[00:14:14.857] - [000333] dn[703e971ed91c]
[00:14:14.860] - [000338]<W> try secured ap config!
[00:14:14.865] - [000342]<E> no valied ap config found!Flashing the removed module worked fine, and here is a template for it:
{
"vendor": "Amysen",
"bDetailed": "0",
"name": "Amysen Wifi Smart Plug YX-WS01",
"chip": "BL602",
"board": "YX-X3-T71C-VER03",
"pins": {
"1": "LED_n;1",
"12": "Rel;1",
"16": "Btn;1"
},
"keywords": [
"plug",
"relay",
"TG7100C"
],
"image": "https://obrazki.elektroda.pl/9135692300_1704034050.jpg",
"wiki": "https://www.elektroda.com/rtvforum/viewtopic.php?p=20886589"
}
Comments
That's a nice find, how does the boot log from this device looks like? Isn't IO8 a 'BOOT' pin on BL602? Have you watched BL602 guides? [Read more]
Success finally! The problem was partly with the power supply. After sorting that out, I did get it to flash. Transcript below, showing first the tail end of an unsuccessful flash, then a successful... [Read more]
@pkaczmarek2 Question: How much better is the CH340G over the older FTDI ttl-232r-3v3? With the CH340G, do I need separate PSU to supply the 3.3VDC to the board? If so, is it a high-quality... [Read more]
I would say that you need to either use an external 3.3V LDO regulator or a board that has such LDO regulator, if there is no AMS1117-3.3-like LDO regulator on your board, then it will not work. This... [Read more]
OK, I think I'm beginning to see a difference in the way these Amysen devices behave, versus the Sonoff S40. When I would power on the Sonoff S40 with a power supply, it gave a strong click, and the LEDs... [Read more]
@davidcpurdy I am usually desoldering modules from the main board for flashing, it's always a good practice. Sometimes the capacitance on the main board is so high that connecting power directly from USB... [Read more]
@pkaczmarek2 : 1. Is a buck converter generally enough to step down, say 6VDC to 3.3VDC? Is the LDO absolutely necessary to get ride of any variation in that voltage (ie. like spikes, ripples)? The... [Read more]
The buck converter you mention supports 3A output current which is way more than any Tuya WiFi module may even require. This should work, altough I'd always make sure to put a decoupling capacitor at the... [Read more]
OK, just checking my own sanity here... Desoldering/disassembling the plug leads from the board to get access to the solder joints for the Wifi Module is a pain, but the upside is that flashing the removed... [Read more]
Good job, so why didn't it flash in circuit? Maybe RX/TX or boot was used for some other purpose on the board? [Read more]
I may have figured out one piece of the puzzle as to why neither flashing nor even basic UART communication has been working on this plug while the Wifi board is attached before today. I got the CH340G... [Read more]
So the previous USB to UART converter did not work? [Read more]
I was not able to flash onboard w/ the FTDI adapter, but i was able to w the CH340g. I’m not sure what the reason is, but I had read years ago that the CH340g was somehow more stable. If I remember... [Read more]