Pressure, temperature and humidity sensor based on MS5637 HDC1080
This is anothe small module to measure air pressure, temperature and humidity. Two sensors are on-board: MS5637 and HDC1080. Microcontroller is small cortex M0 in TSSOP-20 housing from STM: STM32F070CxP. The SN65HVD72DGKR provides RS485 interface functionality with half duplex mode. Voltage regulator, reverse polarity protection and some LED indicators are provided on-board. Complete module is 10x55mm, produced on single-sided PCB, easily producible in every home lab with proto-PCB capability.
RH, T and air pressure sensor with RS485
Firmware for the sensor is on the GitHub in my MS5637_HDC1080 repository.
Sensor has default HDLC address 0x31 and unique ID 0x0d000011.
Initial version has following HDLC commands
enum { CMD_Temperature = 0x40, /// Temperature readout from hdc1080 CMD_Humidity, /// Humidity readout from hdc1080 CMD_Bat, /// battery readout from hdc1080 CMD_Pressure, /// Air pressure in hPa or mbar abs CMD_pTemperature, /// Temperature readout from pressure sensor CMD_pCAL, /// Calibration coefficients from pressure sensor CMD_pD1, /// Raw pressure readout from pressure sensor CMD_pD2, /// Raw temperature from pressure sensor CMD_ID, /// Identification }; |
Drivers for both sensors are:
https://github.com/s54mtb/MS5637_HDC1080/blob/master/src/hdc1080.c
https://github.com/s54mtb/MS5637_HDC1080/blob/master/src/MS5637.c
Other project resources:
Single sided PCB
Schematic diagram
“Toner transfer” artwork for single sided PCB: RHTP
Here is complete documentation for the PCB, schematic and BOM:
Bok,
te zanimajo senzorji temperature in vlage Si7013 in Si7021? Imam vzorce, pa ti lahko kakega odstopim (ti prinese Karmen). So kar hitri v Si, v 4 dneh sem jih dobil.
lp, damjan
Živjo,
ja, kak dodaten si7013 bi prišel prav, ker mislim pokrit bližnji okoiš s temi senzorji in bo prišlo prav.
Hvala!
Dobiš. Zanimivo bi bilo tudi narediti varianto s CC1101 namesto 485 komunikacije.