Raspberry Pi3

• Small Linux computer, under $100

• eco/PowerMonitoring

• Pi3/led1.py

• WiFi AP https://frillip.com/using-your-raspberry-pi-3-as-a-wifi-access-point-with-hostapd/ ^ https://developer.android.com/things/hardware/raspberrypi-io.html

Raspberry Pi3 - Led Flash

• Get pin-out from the linux terminal, just run https://www.raspberrypi.org/documentation/usage/gpio/

  pinout

Pi3 Temperature sensor

• Links Arduino/DS18B20TempSensors

• pi3 - Linux - w1_gpio driver, connect temp sensor DS18B20 as in https://pinout.xyz/pinout/1_wire

• http://temp-pi3.s3-website-us-east-1.amazonaws.com/

• https://pimylifeup.com/raspberry-pi-temperature-sensor/

• https://pinout.xyz/pinout/1_wire

• 2018-05-03 Working

  1. Setup the overlay for 1-wire in pi3 config, and reboot.
     • visible under /sys/devices/w1_bus_master1
  2. It was picking up spurious clients, probably due to no pull up on gpio-4(pin-7)
     • Wire to breadboard pin 1 (Top/Edge, Left(away from edge)) 3.3v
     • Wire to breadboard pin 6 (3rd from Top, on Right edge) GND
     • Wire to breadboard pin 7 (1-wire) and connect with pull-up 4.7k resistor to 3.3v (pin-1) rail

  3. Now there should be no devices.

     cat /sys/devices/w1_bus_master1/w1_master_slave_count 

  4. Attache the 3 pins or the DS18B20 to Gnd, 3.3v, 1-wire+pull-up 4.7k.

     • Now see once device connected and can read mC° e.g.

       # cat /sys/devices/w1_bus_master1/28-000003574871/w1_slave 
       b8 00 4b 46 7f ff 08 10 b7 : crc=b7 YES
       b8 00 4b 46 7f ff 08 10 b7 t=11500

Buy pi3 in NZ

• https://nz.rs-online.com/web/authHome.html

• pishop.nz

Pi3 - CEC HDMI controll

• https://blog.gordonturner.com/2016/12/14/using-cec-client-on-a-raspberry-pi/

  • e.g. switch television off with

    echo "standby 0" | cec-client RPI -s -d 1

  • http://www.cec-o-matic.com/

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