[BK7231N] Teardown and flashing of Atorch GR2P-WS: DIN rail device with graphic screen

morgan_flint wrote:

My new GR2PWS version, GR2PWSL, finally arrived!
As could be foreseen from the photos in the advertisement I posted in the referred post, it's a different version than the previous GR2PWS devices shown in this thread, not only beacause this one has an external current transformer (and tha associated components in the PCB), but also because the MCU FW is different (more options in the device's screen), and also hardware differences (another MCU). On the other hand, and from the MCU - WiFi Module communication perspective, no important changes have been made, as we have the same dpIDs with only a slight difference (more on this later).

To start with, let's see the update screen in the Tuya App:
https://obrazki.elektroda.pl/1697540500_1749375963.jpg

Compared to those of my older devices, posted in the referred post:
https://obrazki.elektroda.pl/2600906000_1748532213.jpg https://obrazki.elektroda.pl/5003555000_1748532213.jpg

So, new versions for both the Main module and the MCU module.

Now, the HW differences:
https://obrazki.elektroda.pl/6275752300_1749376378.jpg

The layout has some differences with the previous one, the most eye-catching being the MCU and the location of its programming port. Let's see some details:
https://obrazki.elektroda.pl/7594355000_1749376517.jpg https://obrazki.elektroda.pl/1113254200_1749376517.jpg https://obrazki.elektroda.pl/2711401900_1749376517.jpg https://obrazki.elektroda.pl/7309950500_1749376517.jpg https://obrazki.elektroda.pl/7015601800_1749376644.jpg

The MCU is very different (32 pins instead of 28), but the main components (SMPS, metering, relay driver) are very similar to the previous version. Of course, the shunt resistor (510 ohm) for the leakage current measuring, and also the equivalents of the other two missing in the other ones, are installed in this one:
https://obrazki.elektroda.pl/8215954800_1749376768.jpg url=https://obrazki.elektroda.pl/2809551800_1749377086.jpg] https://obrazki.elektroda.pl/2809551800_1749377086_thumb.jpg

The other two components are a series resistor (also around 500 ohms) and a capacitor to GND, as I suspected in the previous post:


I could check that the residual current transformer has a relationship of 1:1000:
https://obrazki.elektroda.pl/4294822100_1749377273.jpg

So I guess just adding these 4 components (current transformer, shunt resistor, series resistor, and capacitor), it would be possible to measure leakage current in the older devices, as the FW seemed to be prepared for it also in them. Alternatively, the pin where the resistance is connected can be used to measure a voltage between 0 and 102 mV (would be interpreted by the FW as 0 - 200 mA, approximately).

Now, let's see the differences in the FW from the device's screen point of view. These are very similar, maybe a slight difference in colours:
https://obrazki.elektroda.pl/4652257000_1749377610.jpg https://obrazki.elektroda.pl/9345609500_1749377609.jpg https://obrazki.elektroda.pl/8146647000_1749377609.jpg https://obrazki.elektroda.pl/2340647000_1749377609.jpg

The differences start with the graphics:
https://obrazki.elektroda.pl/3769325000_1749377711.jpg https://obrazki.elektroda.pl/9055642800_1749377731.jpg https://obrazki.elektroda.pl/7592500900_1749377688.jpg

And continue in the settings menu, and a new standby screen:
https://obrazki.elektroda.pl/8282732100_1749377843.jpg https://obrazki.elektroda.pl/9483430900_1749377843.jpg https://obrazki.elektroda.pl/9682585500_1749377843.jpg https://obrazki.elektroda.pl/9862686700_1749377844.jpg https://obrazki.elektroda.pl/4046894400_1749399608.jpg https://obrazki.elektroda.pl/1107166800_1749399630.jpg https://obrazki.elektroda.pl/8530432800_1749401056.jpg
I'll stop here by now because I have to leave, but still have to add more info later...

It's curious, but there isn't an entry in the screen menus to set the residual current limit and enable protection; this is done in the Tuya App (also present in the model without the necessary HW):
https://obrazki.elektroda.pl/1509943100_1749400441.jpg https://obrazki.elektroda.pl/2205855100_1749400441.jpg

And this is the info on the screen and the App after a leakage:
https://obrazki.elektroda.pl/6598518600_1749400504.jpg https://obrazki.elektroda.pl/8801756800_1749400505.jpg https://obrazki.elektroda.pl/6698236100_1749400504.jpg

To conclude this long post, this is the "Things Data Model" from Tuya Developer's web, extracted according to my tutorial :
{
"modelId": "e1kylf6c",
"services": [
{
"actions": [],
"code": "",
"description": "",
"events": [],
"name": "",
"properties": [
{
"abilityId": 1,
"accessMode": "rw",
"code": "switch_1",
"description": "",
"extensions": {
"iconName": "icon-dp_power2",
"attribute": "1024"
},
"name": "开关状态",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 9,
"accessMode": "rw",
"code": "countdown_1",
"description": "",
"extensions": {
"iconName": "icon-dp_time2",
"attribute": "1120"
},
"name": "开关倒计时",
"typeSpec": {
"type": "value",
"max": 360000,
"min": 0,
"scale": 0,
"step": 1,
"unit": "s"
}
},
{
"abilityId": 17,
"accessMode": "rw",
"code": "add_ele",
"description": "",
"extensions": {
"iconName": "icon-battery",
"attribute": "1120",
"trigger": "direct"
},
"name": "增加电量",
"typeSpec": {
"type": "value",
"max": 5000000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "kwh"
}
},
{
"abilityId": 18,
"accessMode": "ro",
"code": "cur_current",
"description": "",
"extensions": {
"iconName": "icon-Ele",
"attribute": "1088"
},
"name": "当前电流",
"typeSpec": {
"type": "value",
"max": 120000,
"min": 0,
"scale": 3,
"step": 1,
"unit": "A"
}
},
{
"abilityId": 19,
"accessMode": "ro",
"code": "cur_power",
"description": "",
"extensions": {
"iconName": "icon-dp_tool",
"attribute": "1088"
"name": "当前功率",
"typeSpec": {
"type": "value",
"max": 2700000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "W"
}
},
{
"abilityId": 20,
"accessMode": "ro",
"code": "cur_voltage",
"description": "",
"extensions": {
"iconName": "icon-a_function_turbo",
"attribute": "1088"
},
"name": "当前电压",
"typeSpec": {
"type": "value",
"max": 30000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "V"
}
},
{
"abilityId": 101,
"accessMode": "rw",
"code": "price",
"description": "",
"extensions": {"scope": "", "cloudless": 1 },
"name": "电费单价：",
"typeSpec": {
"type": "value",
"max": 99999,
"min": 0,
"scale": 3,
"step": 1,
"unit": ""
}
},
{
"abilityId": 102,
"accessMode": "ro",
"code": "cost",
"description": "",
"name": "总电费",
"typeSpec": {
"type": "value",
"max": 50000000,
"min": 0,
"scale": 3,
"step": 1,
"unit": ""
}
},
{
"abilityId": 103,
"accessMode": "ro",
"code": "add_cost",
"description": "",
"extensions": { "trigger": "direct" },
"name": "电费",
"typeSpec": {
"type": "value",
"max": 5000000,
"min": 0,
"scale": 2,
"step": 1,
"unit": ""
}
},
{
"abilityId": 104,
"accessMode": "rw",
"code": "ovp",
"description": "",
"extensions": { "cloudless": 1 },
"name": "过压值",
"typeSpec": {
"type": "value",
"max": 3200,
"min": 1,
"scale": 1,
"step": 1,
"unit": "V"
}
},
{
"abilityId": 105,
"accessMode": "rw",
"code": "ocp",
"description": "",
"extensions": { "cloudless": 1 },
"name": "过流值",
"typeSpec": {
"type": "value",
"max": 1000,
"min": 1,
"scale": 1,
"step": 1,
"unit": "A"
}
},
{
"abilityId": 106,
"accessMode": "rw",
"code": "opp",
"description": "",
"extensions": { "cloudless": 1 },
"name": "过功率值",
"typeSpec": {
"type": "value",
"max": 32000,
"min": 1,
"scale": 0,
"step": 1,
"unit": "W"
}
},
{
"abilityId": 107,
"accessMode": "rw",
"code": "language",
"description": "",
"extensions": { "cloudless": 1 },
"name": "设备语言",
"typeSpec": {
"type": "enum",
"range": ["chinese", "english"]
}
},
{
"abilityId": 108,
"accessMode": "rw",
"code": "work_value",
"description": "",
"extensions": { "cloudless": 1 },
"name": "工作屏幕亮度",
"typeSpec": {
"type": "value",
"max": 9,
"min": 1,
"scale": 0,
"step": 1,
"unit": ""
}
},
{
"abilityId": 109,
"accessMode": "rw",
"code": "standby_value",
"description": "",
"extensions": { "cloudless": 1 },
"name": "待机屏幕亮度",
"typeSpec": {
"type": "value",
"max": 9,
"min": 0,
"scale": 0,
"step": 1,
"unit": ""
}
},
{
"abilityId": 110,
"accessMode": "rw",
"code": "standby_time",
"description": "",
"extensions": { "cloudless": 1 },
"name": "进入待机时间",
"typeSpec": {
"type": "value",
"max": 99,
"min": 3,
"scale": 0,
"step": 1,
"unit": "s"
}
},
{
"abilityId": 111,
"accessMode": "rw",
"code": "beep",
"description": "",
"name": "系统声音",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 112,
"accessMode": "rw",
"code": "sw_mode",
"description": "",
"extensions": { "cloudless": 1 },
"name": "开关模式",
"typeSpec": {
"type": "enum",
"range": ["controlled", "normally_open"]
}
},
{
"abilityId": 113,
"accessMode": "rw",
"code": "data_reset",
"description": "",
"extensions": { "cloudless": 1 },
"name": "累计数据清零",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 114,
"accessMode": "rw",
"code": "wifi_reset",
"description": "",
"extensions": { "cloudless": 1 },
"name": "wifi设备重置",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 115,
"accessMode": "rw",
"code": "factor_reset",
"description": "",
"extensions": { "cloudless": 1 },
"name": "恢复出厂设置",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 116,
"accessMode": "rw",
"code": "screen_rotation",
"description": "",
"extensions": { "cloudless": 1 },
"name": "屏幕旋转",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 117,
"accessMode": "rw",
"code": "standby_screen",
"description": "",
"extensions": { "scope": "", "cloudless": 1 },
"name": "待机画面",
"typeSpec": {
"type": "enum",
"range": ["original", "measurement", "calendar", "screen_off"]
}
},
{
"abilityId": 118,
"accessMode": "rw",
"code": "menu",
"description": "",
"extensions": { "cloudless": 1 },
"name": "设备显示风格：",
"typeSpec": {
"type": "enum",
"range": ["front", "back", "display_off"]
}
},
{
"abilityId": 119,
"accessMode": "rw",
"code": "lvp",
"description": "",
"extensions": { "cloudless": 1 },
"name": "欠压值",
"typeSpec": {
"type": "value",
"max": 3200,
"min": 1,
"scale": 1,
"step": 1,
"unit": "V"
}
},
{
"abilityId": 120,
"accessMode": "rw",
"code": "control",
"description": "",
"name": "超限控制使能",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 121,
"accessMode": "rw",
"code": "olcp",
"description": "",
"extensions": {"scope": ""},
"name": "漏电阀值：",
"typeSpec": {
"type": "value",
"max": 200,
"min": 1,
"scale": 3,
"step": 1,
"unit": "A"
}
},
{
"abilityId": 122,
"accessMode": "ro",
"code": "leakage_ele",
"description": "",
"name": "漏电总电量",
"typeSpec": {
"type": "value",
"max": 999999999,
"min": 0,
"scale": 3,
"step": 1,
"unit": "kw.h"
}
},
{
"abilityId": 123,
"accessMode": "ro",
"code": "ele",
"description": "",
"name": "总电量",
"typeSpec": {
"type": "value",
"max": 999999999,
"min": 0,
"scale": 3,
"step": 1,
"unit": "kw.h"
}
},
{
"abilityId": 124,
"accessMode": "rw",
"code": "leakage_current",
"description": "",
"extensions": {
"iconName": "icon-power1",
"attribute": "4096"
},
"name": "漏电电流",
"typeSpec": {
"type": "value",
"max": 120000,
"min": 0,
"scale": 3,
"step": 1,
"unit": "A"
}
},
{
"abilityId": 125,
"accessMode": "rw",
"code": "reporting_interval",
"description": "",
"extensions": { "cloudless": 1 },
"name": "测量数据刷新间隔时间",
"typeSpec": {
"type": "value",
"max": 90,
"min": 1,
"scale": 0,
"step": 1,
"unit": "S"
}
},
{
"abilityId": 126,
"accessMode": "rw",
"code": "real_time_switch_5s_60s",
"description": "",
"name": "数据实时刷新开关",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 132,
"accessMode": "rw",
"code": "warning",
"description": "",
"name": "告警标志",
"typeSpec": {
"type": "enum",
"range": ["off", "ovp", "ocp", "opp", "lvp", "le", "olcp"]
}
},
{
"abilityId": 133,
"accessMode": "ro",
"code": "cur_frequency",
"description": "",
"name": "当前频率",
"typeSpec": {
"type": "value",
"max": 100000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "Hz"
}
},
{
"abilityId": 134,
"accessMode": "ro",
"code": "power_factor",
"description": "",
"name": "功率因数",
"typeSpec": {
"type": "value",
"max": 100,
"min": 0,
"scale": 2,
"step": 1,
"unit": "PF"
}
},
{
"abilityId": 135,
"accessMode": "ro",
"code": "cpu_temp",
"description": "",
"extensions": { "cloudless": 1 },
"name": "仪表CPU温度",
"typeSpec": {
"type": "value",
"max": 150,
"min": 0,
"scale": 0,
"step": 1,
"unit": "℃"
}
},
{
"abilityId": 136,
"accessMode": "rw",
"code": "price_mode",
"description": "",
"name": "电费计价模式：",
"typeSpec": {
"type": "enum",
"range": ["single_rate", "stair", "peak_valley_stair"]
}
},
{
"abilityId": 137,
"accessMode": "rw",
"code": "over_time",
"description": "",
"name": "超限电压恢复延时：",
"typeSpec": {
"type": "value",
"max": 99,
"min": 0,
"scale": 0,
"step": 1,
"unit": "min"
}
},
{
"abilityId": 138,
"accessMode": "rw",
"code": "ttl",
"description": "",
"name": "设备上电开关状态：",
"typeSpec": {
"type": "enum",
"range": ["memory"]
}
},
{
"abilityId": 139,
"accessMode": "rw",
"code": "prepayment_switch",
"description": "",
"name": "预付费开关",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 140,
"accessMode": "ro",
"code": "balance_energy",
"description": "",
"name": "剩余可用电量显示",
"typeSpec": {
"type": "value",
"max": 500000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "kW·h"
}
},
{
"abilityId": 141,
"accessMode": "rw",
"code": "clear_energy",
"description": "",
"name": "剩余可用电量清零",
"typeSpec": { "type": "bool" }
},
{
"abilityId": 142,
"accessMode": "rw",
"code": "energy_charge",
"description": "",
"name": "电量充值",
"typeSpec": {
"type": "value",
"max": 500000,
"min": 0,
"scale": 2,
"step": 1,
"unit": "kW·h"
}
},
{
"abilityId": 143,
"accessMode": "rw",
"code": "credit",
"description": "",
"name": "电量不足报警值",
"typeSpec": {
"type": "value",
"max": 500,
"min": 10,
"scale": 0,
"step": 1,
"unit": "kW·h"
}
}
]
}
]
}


Translation of Chinese words is a pending job for @ElektrodaBot... I asked him to do another translation for me here , but he seems to be ignoring that thread 😂😂

On comparing this JSON with the one for the previous models, apart from the ModelID, I've only found one significant difference, that is the scale in dpID 101 (electricity price), which changed from 2 to 3. ModelId and ProductId have changed:
https://obrazki.elektroda.pl/1190042900_1749401973.jpg
https://obrazki.elektroda.pl/8885713000_1749401973.jpg

@divadiow: Still pending to extract the backup of the WiFi module's FW, I'll try to do it soon