Mywk / FlipperTemperatureSensor

App for the Flipper Zero that reads the signal from a HTU21D or Si7021 sensor and displays the current temperature and humidity.

Flipper Temperature Sensor

Note

This app is no longer actively developed, please check unitemp-flipperzero.

You can still use this project for a super simple and easy to understand first-app template, especially v1.0.

Supported sensors

HTU2xD, SHT2x, SI702x, SI700x, SI701x, AM2320

What is this?

A small app for the Flipper Zero that reads the I2C signal from a few temperature sensors and displays the current temperature and humidity.

I'm using a Sparkfun HTU21D sensor, also tested with a clone and with the Si7021 variant.

How to Connect the HTU21D sensor

How to install

If you have the FAP loader, just copy the fap file from the Releases into your Flipper apps folder and you should be able to launch it from the menu.

If you don't have the FAP loader you will have to bake this application together with your firmware (aka compile it all together).

FAQ

The app says the sensor is not found!

1- Are the four connectors correctly soldered?

2- Are the SCL and SDA connections correct? Re-check the "How to Connect the sensor" above.

3- For the HTU21D, on the sensor board, there should be three contacts in the center, for it to work correctly they must be soldered together (basically drop a blob of solder to connect the three of them). Without the solder it looks like this:

Which Flipper versions was this app tested on?

Version 1.2

• RM11221439-0.71.2
• unlshd-015
• 0.71.1

Version 1.1

• RM10302252-0.70.1
• unlshd-012
• 0.68.2-1007-RM
• 0.68.1
• 0.67.2

I can't build the app together with the firmware?

In the application.fam, don't forget to change the apptype, it should not be EXTERNAL but APP.

How to compile

Place the temperature_sensor folder in the applications_user folder and compile using FBT.

Please refer to the Flipper Build Tool documentation.