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→MCP23017 pins
Make Notes!!
Make Notes!!
===How do I connect things at the Raspberry Pi End for an MCP23017?===
The I2C connection requires only two wires 2nd the Raspberry Pi is specifically designed to accept an I2C connection on Pins 3 (SDA Data) & Pin 5 (SCL Clock).
Also Two Interrupt lines are also required and these can be any pin address in the webconf drop down. It defaults to
{| class="wikitable"
|+ Raspberry Pi GPIO Pins
|-
! Odd Pins !! Function !! Function !! Even Pins
|-
| Pin 1 || <span style="color:#FFFFFF; background:#aa5500">3v3 Power</span> || <span style="color:#FFFFFF; background:#ff0000">5v0 Power</span> || Pin 2
|-
| Pin 3 || <span style="color:#FFFFFF; background:#aa9900">I2C SDA Data Pin</span> || <span style="color:#FFFFFF; background:#ff0000">5v0 Power</span> || Pin 4
|-
| Pin 5 || <span style="color:#FFFFFF; background:#aa9900">I2C SCL Clock Pin</span> || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || Pin 6
|-
| Pin 7 || - || - || Pin 8
|-
| Pin 9 || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || - || Pin 10
|-
| Pin 11 || - || - || Pin 12
|-
| Pin 13 || - || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || Pin 14
|-
| Pin 15 || - || - || Pin 16
|-
| Pin 17 || <span style="color:#FFFFFF; background:#aa5500">3v3 Power</span> || - || Pin 18
|-
| Pin 19 || - || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || Pin 20
|-
| Pin 21 || - || - || Pin 22
|-
| Pin 23 || - || - || Pin 24
|-
| Pin 25 || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || - || Pin 26
|-
| Pin 27 || - || - || Pin 28
|-
| Pin 29 || - || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || Pin 30
|-
| Pin 31 || - || - || Pin 32
|-
| Pin 33 || - || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || Pin 34
|-
| Pin 35 || - || <span style="color:#FFFFFF; background:#aa9900">MCP23017 INT-A Pin</span> || Pin 36
|-
| Pin 37 || <span style="color:#FFFFFF; background:#aa9900">MCP23017 INT-B Pin</span> || -|| Pin 38
|-
| Pin39 || <span style="color:#FFFFFF; background:#000000">0v Ground</span> || - || Pin 40
|}
=== Connecting via the GPIO Pins. ===
=== Connecting via the GPIO Pins. ===