Hello,
I am using a Tuya T1-3S 4-gang switch module with BK7238 and flashed OpenBeken 1.18.247.
Relay control via UI/MQTT works correctly, but physical wall switches do not work.
Hardware details:
Module: T1-3S
MCU: BK7238
Switch wiring: Common LIVE (active-HIGH)
Original Tuya firmware worked fine with this wiring.
Current Pin Mapping:
Relays:
P9 = Relay 1
P24 = Relay 2
P23 = Relay 3
P6 = Relay 4
Switch Inputs:
P8 = Input CH1
P10 = Input CH2
P22 = Input CH4
P26 = Input CH3
Configured as:
dInput / Btn / dInput_n tested
Channel type = Toggle
Problem:
In OpenBeken log I constantly get:
Button_OnLongPressHold
on all button GPIOs:
8, 10, 22, 26
This happens even when no button is pressed.
So OpenBeken always sees the inputs as "held", and no toggle event is generated.
Root Cause (Suspected):
My switches are wired as Active-HIGH (LIVE → switch → GPIO).
BK7238 seems to only support internal pull-UP, not pull-DOWN.
Because of this:
GPIO idle state floats or stays HIGH
No stable LOW state exists
Long-press condition is triggered permanently
Attempted Fix:
Tried to use:
PinMode 8 input_pulldown
But received:
Error: CMD PinMode NOT found
Conclusion:
It appears that BK7238 hardware does not support internal pull-down resistors, so active-HIGH common-live switch wiring cannot work without:
External pulldown resistors (ex: 10k to GND), or
Rewiring switches to dry-contact logic (GPIO → Switch → GND)
Question:
Is there any planned support for:
Software pulldown emulation (if possible), or
Better documentation for BK7238 input limitations with AC common-live Tuya boards?
Thanks.
Managed to flash it
I am using a Tuya T1-3S 4-gang switch module with BK7238 and flashed OpenBeken 1.18.247.
Relay control via UI/MQTT works correctly, but physical wall switches do not work.
Hardware details:
Module: T1-3S
MCU: BK7238
Switch wiring: Common LIVE (active-HIGH)
Original Tuya firmware worked fine with this wiring.
Current Pin Mapping:
Relays:
P9 = Relay 1
P24 = Relay 2
P23 = Relay 3
P6 = Relay 4
Switch Inputs:
P8 = Input CH1
P10 = Input CH2
P22 = Input CH4
P26 = Input CH3
Configured as:
dInput / Btn / dInput_n tested
Channel type = Toggle
Problem:
In OpenBeken log I constantly get:
Button_OnLongPressHold
on all button GPIOs:
8, 10, 22, 26
This happens even when no button is pressed.
So OpenBeken always sees the inputs as "held", and no toggle event is generated.
Root Cause (Suspected):
My switches are wired as Active-HIGH (LIVE → switch → GPIO).
BK7238 seems to only support internal pull-UP, not pull-DOWN.
Because of this:
GPIO idle state floats or stays HIGH
No stable LOW state exists
Long-press condition is triggered permanently
Attempted Fix:
Tried to use:
PinMode 8 input_pulldown
But received:
Error: CMD PinMode NOT found
Conclusion:
It appears that BK7238 hardware does not support internal pull-down resistors, so active-HIGH common-live switch wiring cannot work without:
External pulldown resistors (ex: 10k to GND), or
Rewiring switches to dry-contact logic (GPIO → Switch → GND)
Question:
Is there any planned support for:
Software pulldown emulation (if possible), or
Better documentation for BK7238 input limitations with AC common-live Tuya boards?
Thanks.
Managed to flash it
{
"rl1_lv":"1",
"netled_lv":"0",
"bt1_pin":"8",
"onoff_clear_t":"5",
"net_trig":"1",
"cd_flag2":"1",
"ffc_select":"1",
"nety_led":"0",
"netled_pin":"11",
"total_stat":"2",
"bt1_lv":"1",
"module":"T1-3S",
"rl2_pin":"24",
"light_status_select":"1",
"bt2_lv":"1",
"rl1_pin":"9",
"rl4_lv":"1",
"onoff_rst_m":"1",
"rl3_pin":"23",
"onoff_cnt":"7",
"rl3_lv":"1",
"onoff_n":"3",
"rl4_pin":"6",
"jv":"1.2.1",
"pd_category":"1",
"ext_bt_type":"3",
"bt3_lv":"1",
"reset_t":"5",
"rl2_lv":"1",
"ch_flag1":"1",
"ch_flag3":"1",
"bt4_pin":"22",
"ch_flag4":"1",
"bt3_pin":"26",
"ch_cddpid1":"7",
"ble_pair_time":"30",
"clean_t":"5",
"bt4_lv":"1",
"zero_select":"0",
"bt2_pin":"10",
"ch_cddpid4":"10",
"ch_cddpid2":"8",
"ch_cddpid3":"9",
"ch_num":"4",
"ch_dpid3":"3",
"ch_dpid4":"4",
"netn_led":"1",
"ch_dpid1":"1",
"ch_dpid2":"2",
"crc":"98"
}
