[BK7231N/CB3S] Tuya Smart Air Box Air Quality Monitor, 5 sensors

Question

I have problems getting the values ​​out after switching to OpenBeken With original firmware this is read out: Autoexec.bat After I switch to OpenBeken, this is read out Anyone have any suggestions what I have missed?

divadiow · Accepted Answer

I'm probably forgettng something obvious and if you enter command tuyaMcu_sendQueryState do you get all the current dpID statuses returned to the log?

divadiow · Accepted Answer

template for device list Code: JSONLog in, to see the code Added after 1 [minutes]: only to post here and to see if there's anything else of interest from it. I would flash to my own device to see what boot log is. if you'd rather DM it me I can attempt factory reset and put fake credentials into it Added after 34 [minutes]:boot log. known patched v2.1.17 so cloudcutter no good Code: TextLog in, to see the code

divadiow · Answer

>>21169769 at what baud did you capture original comms? if 115200, add tuyaMcu_setBaudRate 115200 to your autoexec

lars4 · Answer

>>21169772 unfortunately it doesn't help. Used 9600 as default

divadiow · Answer

was the CB3S removed from the PCB for flashing? Is there definitely continuity between the module and the pad, between the very edge of the gold contact on the module and the silver pad on PCB, eg between these dots and then continuity onwards to the legs of the MCU it's talking to?

lars4 · Answer

>>21169786 No, it was not removed. No resistors had to be unsoldered either, it was still possible to flash. I have tried to flash back the original firmware and then everything works as it did before

divadiow · Answer

oh. what if you get rid of startDriver tmSensor

lars4 · Answer

>>21169789 I've tried it, it came up with different information in the serial log; unfortunately, I don't have a screenshot of it, but I can get that if needed.

divadiow · Answer

could do? im not sure what to suggest next.

lars4 · Answer

>>21169812 without startDriver tmSensor

divadiow · Answer

oh hang on. add tuyaMcu_defWiFiState 4 under startDriver TuyaMCU

lars4 · Answer

>>21169837 Still no values Autoexec.bat Code: text Expand Select all Copy to clipboardstartDriver TuyaMCU //startDriver tmSensor tuyaMcu_defWiFiState 4 tuyaMcu_setBaudRate 9600 setChannelType 1 Temperature_div10 linkTuyaMCUOutputToChannel 18 val 1 setChannelType 2 Humidity_div10 linkTuyaMCUOutputToChannel 19 val 2 setChannelType 3 Custom SetChannelLabel 3 CH2O mg/m^3 linkTuyaMCUOutputToChannel 2 val 3 setChannelType 4 Custom SetChannelLabel 4 VOC ppm linkTuyaMCUOutputToChannel 21 val 4 setChannelType 5 Custom SetChannelLabel 5 CO2 ppm linkTuyaMCUOutputToChannel 22 val 5

lars4 · Answer

>>21169855 Now I got the values after entering the command tuyaMcu_sendQueryState Thanks!!! After restarting, I need to send the command again for it to display the values

divadiow · Answer

ah ok ok. good

lars4 · Answer

>>21169866 Working autoexec.bat Code: text Expand Select all Copy to clipboardstartDriver TuyaMCU tuyaMcu_defWiFiState 4 tuyaMcu_setBaudRate 9600 setChannelType 1 Temperature_div10 linkTuyaMCUOutputToChannel 18 val 1 setChannelType 2 Humidity_div10 linkTuyaMCUOutputToChannel 19 val 2 setChannelType 3 Custom SetChannelLabel 3 CH2O mg/m^3 linkTuyaMCUOutputToChannel 2 val 3 setChannelType 4 Custom SetChannelLabel 4 VOC ppm linkTuyaMCUOutputToChannel 21 val 4 setChannelType 5 Custom SetChannelLabel 5 CO2 ppm linkTuyaMCUOutputToChannel 22 val 5 tuyaMcu_sendQueryState Thanks so much for your help!

divadiow · Answer

no worries. is your firmware backup in credential-free state and would you mind sharing it?

lars4 · Answer

>>21169896 it's not in that mode, but do you still have use for it? It doesn't matter to me

p.kaczmarek2 · Answer

Thank you @divadiow for you activity. Some hints from me: - tmSensor is only for battery powered devices - tuyaMcu_sendQueryState can be send in repeating event (like every 15 seconds etc) - TuyaMCU baud rate can be detected from 2MB flash so there is no need to guess - it may be useful to enable PowerSave on this device (as on many others) Extra question: Is this DHT sensor of some kind? On device photo?

divadiow · Answer

I wonder if it's a DHT20. Added after 8 [minutes]:How could the poster confirm apart from desoldering and trying the sensor with one of the DHT sensor driver option or just an Arduino setup? DHT20 isn't mentioned but does the driver support it anyway? I guess if a dump of the MCU flash could be had there might be mention in there of the exact sensor

lars4 · Answer

>>21173494 I'll see what I can figure out. I haven't been home for a couple of days Added after 1 [hours] 44 [minutes]:>>21173494 Yes it is a DHT20 I can't find any information about the second sensor Guess it says BP0315-01# HMNST

divadiow · Answer

>>21173538 oh cool. that was easy that whole module looks similar to this Added after 5 [hours] 39 [minutes]: Not HGS02

divadiow · Answer

The Hefei Micro Nano Sensing Technology Co. Ltd (HMNST) contact Lei has stated the sensor on that module is an HGS1000 Code: TextLog in, to see the code English translated info PDF attached

lars4 · Answer

>>21174757 Perfect, good work!

divadiow · Answer

Code: TextLog in, to see the code The sheet Lei sent has a lot of the same information as the one posted above, but with a bit more detail.

p.kaczmarek2 · Answer

So it's DHT20 indeed. It should work well with OBK directly, without MCU: HGS1000, on the other hand, is not currently supported. I've checked @divadiow 's documents but I can't see any details about the communication protocol used by HGS1000 family. Maybe we would need to hook up a 10$ logic analyzer for that, like I did in some other topics: Added after 1 [minutes]:EDIT: It's UART:

lars4 · Answer

>>21177061 In this case, there is no need for directly connected sensors. The values are reported correctly after the tuyaMcu_sendQueryState command is sent.

io2345 · Answer

I'm thinking about an adapted usage of this AirBox. It should give an alarm sound when certain values are exceeded. To achieve that, I would connect an alarm buzzer (rated 35 mA) to one of the unused Pins of the CB3S. P8 (GPIOP_8) on Pin 13 seems to be available. What will I have to add in the autoexec.bat in Post#15, to set P8 to high (or low, whatever is easier), when at least one of these values are exceeded: - Channel 1 (temperature) is over 550 (that would be 55 degrees) - Channel 2 (humidity) is over 800 (80%) - Channel 3 (CH2O) is over 50 (0,5 mg/m3) - Channel 4 (VOC) is over 50 (5 ppm) - Channel 5 (CO2) is over 700 (700 ppm) For those who want to do the same: Don't connect the Buzzer directly to CB3S's IO-Pin. 35mA is too much for that. Use a simple transitor as switch circle instead, something like this: You can take connections from here: =============================== Done! Not pretty, but working: The + Pin of the Buzzer is soldered to the 3,3V pin, the rest is flying wiring

p.kaczmarek2 · Answer

Probably the simplest way would be to create a loop and check every second. The channel indexes, values and condition in sample below should be adjusted. Code: text Expand Select all Copy to clipboard alias ALARM_ON setChannel 10 1 alias ALARM_OFF setChannel 10 0 again: delay_s 1 if $CH4==0||$CH3>50||$CH2

io2345 · Answer

>>21593616 It always takes a while for my brain to catch up with you. But after some thinking I guess that the block to add at the end of the autoexec.bat should be in my case: Code: text Expand Select all Copy to clipboardalias ALARM_ON setChannel 8 1 alias ALARM_OFF setChannel 8 0 again: delay_s 10 if $CH1>550||$CH2>800||$CH3>50||$CH4>50||$CH5>700  then ALARM_ON  else ALARM_OFF goto again and I'll have to set P8 (PWM2) for example to type Relay and channel 8. Or isn't that necessary at all?

[BK7231N/CB3S] Tuya Smart Air Box Air Quality Monitor, 5 sensors

Post #1

Post #2

Post #3

Post #4

Post #5

Post #6

Post #7

Post #8

Post #9

Post #10

Post #11

Post #12

Post #13

Post #14

Post #15

Post #16

Post #17

Post #18

Post #19

Post #20

Post #21

Post #22

Post #23

Post #24

Post #25

Post #26

Post #27

Post #28

Post #29

Post #30

Topic summary