Blog 21

This is used for both projects:

Hardware used on Raspberry Pi:

• RPi_UI board | (User Interface)
• DIO | (DIO)
• Jumper cables M-F
• 4 PIN I2C cable F-F
• Two analog meters

Programmed with:

• Bash
• Bw tool

Getting the analog meters to work

Change analog meter value through the command line

Recommended to use the DIO protocol.

I have in my example the analog meter connected with pin 3(IO0).

bw_tool -I -D /dev/i2c-1 -a 84 -W 30:01
bw_tool -I -D /dev/i2c-1 -a 84 -W 5f:01
bw_tool -I -D /dev/i2c-1 -a 84 -W 50:80

If you are going to use a pin like pin 10(IO6). With the value 40. The reason it is 40 is, because the bits are in hexadecimals. So, 64 decimal bits gets calculated to 40 hexadecimals.

The reason why this is getting used, is because it is bit masked. With that you can add multiple pins in the command. So, if you you want pin 4(IO1) and pin 6(IO3) on:

IO1 + IO3 -> 02 + 08 = 0A

DIO Cooking timer

Pin	Function	Value
3	IO0	01
4	IO1	02
5	IO2	04
6	IO3	08
8	IO4	10
9	IO5	20
10	IO6	40

Useful links

• DIO
• DIO protocol