HPMA115S0-XXX dust sensor from Honeywell

[espruino-discuss3]

Posted at 2021-09-11 by user134201

Hello guys,

Does anyone know if there is any driver made for HPMA115S0-XXX dust sensor from Honeywell?

https://www.digikey.com/en/products/detail/honeywell-sensing-and-productivity-solutions/HPMA115S0-XXX/7202204

[espruino-discuss3]

Posted at 2021-09-11 by Robin

Sat 2021.09.11

Hi @user134201 it doesn't appear that is the case. The current list of modules that have been developed may be foud at:

http://www.espruino.com/Modules

and an alphabetical list at:

http://www.espruino.com/modules/

Maybe consider writing a module for the Honeywell dust sensor and contribute to the Espruino community perhaps?

http://www.espruino.com/Writing+Modules

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Posted at 2021-09-11 by @MaBecker

The device is using a serial interface for communicatin. As there is no Espruino module available I suggest to find some driver in js or c and port them to work with Espruino.

This looks like a promising c source to convert to javascript:

https://github.com/jedp/AQI-HPMA115-STM32

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Posted at 2021-09-11 by @MaBecker

USART / UART / Serial Port: https://www.espruino.com/USART

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Posted at 2021-09-12 by user134201

Thank you for the advice. It looks like a challenge. I will look into it.

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Posted at 2021-09-23 by parasquid

I wrote some prototype code while road testing an nrf52840 board in element14: https://www.element14.com/community/groups/roadtest/blog/2020/11/13/road-testing-the-pan1780-evaluation-kit-part-5-air-quality-dashboard-via-web-bluetooth

It's not that difficult to get it working. Like MaBe said, it's just serial comms. The tricky bit is to handle the 32byte stream that comes in every second; since it's serial you might get dropped bytes depending on how good your wiring is. In my case I never got the checksum to match the byte calculation, so I just lived with strange pm values every now and then.

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Posted at 2021-09-23 by parasquid

https://gist.github.com/parasquid/808cf63ee6c5e9865df32e3ddb8c795a#file-airquality-js github gist for quick reference :)