Use AM2315 for temperatures below 0°C

am2315-temp-humidity-sensorIn an IoT node I use an AM2315 sensor to measure temperature and humidity. This sensor can be connected via   I2C bus to a NodeMCU module. The results of these periodic measurements are presented here.

On my location these days we had negative temperature on the Celsius scale for the first time in this autumn.

What happened? I had to see wrong temperatures in my graphs.

I looked for the root cause and found that in the used library AM2315.lua the range below 0°C was not handled. The MSB of the temperature value is set in the case of negative temperatures. Therefore I masked this bit and if set the value is multiplied by -1. If you use customized firmware the bit module must be included.

Here are the modified lines for AM2315.lua:

h = string.byte(b[3]) * 256 + string.byte(b[4]) --humidity
h = h / 10
-- MSB is set for negative temperature
t = bit.band(string.byte(b[5]), 127) * 256 + string.byte(b[6]) --temperature
t = t / 10
if bit.isset(string.byte(b[5]), 7) then t = -1 * t end

You will find these modifications on https://github.com/tectiv3/am2315-lua, now.

Finally, here is a temperature graph from today. Winter is coming now 😉

negtemp

Use AM2315 for temperatures below 0°C

ESP8266 IoT Board

This ESP8266 IoT board combines built-in USB and battery charging. The ESP8266 is clocked at 80 MHz and supports 3.3 V logic.

IoT Elecrow - 1

To make it easy to use for portable projects, a connector for 3.7 V Lithium polymer batteries and built in battery charging was added.

You don’t need a battery, it will run just fine straight from the micro USB connector. But, if you do have a battery, you can take it on the go, then plug in the USB to recharge. The board will automatically switch over to USB power when its available. The board comes pre-programmed with NodeMCU Lua.

You can order this ESP8266 IOT Board [DPO82666E] from ELECROW for $12.90. Further info you will find in the ESP8266 IoT Board Wiki.

 

ESP8266 IoT Board

Wio Node

Wio Link now has got a little brother – the Wio Node. Two samples arrived from SeeedStudio today. Have a look to SeeedStudio’s images and compare:

Wio_Node_illustrate

Wio Link-1

Wio Node has the most of features as Wio Link. But it is cheaper, smaller and also lighter in weight.

  • An ESP8266 based open-source Wi-Fi development board (here Espressif’s WROOM-02 is used)
  • Supports Grove Sensors/Actors
  • Visual Configuration via Mobile App (Android & iOS)
  • OTA (Over-The-Air) Firmware Updates
  • RESTful APIs
  • IFTTT Application
  • Powering by Micro USB
  • Battery Holder for re-chargeble LiPo accu

Easy starting at iot.seeed.cc/start.

Wio Node