18650 Lithium Ion Cell and housing


i think PCB and power idea is ready.
DS18B20 temp sensor should work with voltage from 3v to 5v.
Using 18650 cell we have 3,7v nominal voltage and it shouldn’t be discharged as low as 3.0v.

NRF24 works on 3.6v and I’ve tested that it works with voltage a bit above 4v.

Whole housing design will be nice and clean

sensor2_2016-Jun-27_2 sensor2_2016-Jun-27


Board have integrated reset button and status LED (both – SMD and THT mount is possible).

It have SDA/SCL and RX/TX lines available on pin-header.

There is also some place above PCB, i have to check whether SSD1306 oled screen will fit it.

Battery sensor – second edition


last dual layer PCB design wasn’t good enough to build good, working battery sensor. There were some mistakes that should be corrected before using it.

First mistake:

  • diameter of the VIAs was to small, it was very hard to drill and solder it properly.
  • programming socket was under NRF24 radio so it was impossible to solder the radio module directly to board without additional socket.
  • VIA under AVR TQFP32 chip makes it really hard to solder AVR – solder place with wire is to high.
  • Home made PCB don’t have metalized holes! it is impossible to solder some elements properly and well looking under plastic parts.

Continue reading “Battery sensor – second edition”

Temperature Sensor – board, schematic and sketch mod


after long break I would like to show you my sensor board.

Eagle schematic is very simple – one NRF24L01 radio, one Arduino PRO MINI, one 3pin header, one microUSB female slot and one 3.3 voltage regulator. Capacitor is attached directly to radio pins as described here.

3PIN header have VCC, GND and DATA pins so you can add e.g. simple DS18b20 temperature sensor.



Continue reading “Temperature Sensor – board, schematic and sketch mod”

Gateway and Controller – part 1


today i’ll show you how to run controller with gateway attached (remember how it works? Arduino with custom shield with NRF24L01 attached works as Serial Gateway and rPi works as a Controller).

Step 1.

Make Serial Gateway – (i think i have to make a full tutorial – step by step guide, hope it will be soon):

Download whole mySensors lib and upload serial gateway sketch into Arduino (in my case Uno)


Step 2.

Serial Gateway connect to rPi with USB cable.

Continue reading “Gateway and Controller – part 1”