Wiren Board 4: List of GPIOs

GPIOs for FETs (open-drain outputs)

terminal block	function	GPIO #	SoM pin	comments
ADC1 terminal block	FET/ADC	17	20 @ CON1	Open-drain output; ADC channel 3
ADC2 terminal block	FET/ADC	7	18 @ CON1	open-drain output; ADC channel 4
ADC3 terminal block	FET/ADC	5	16 @ CON1	open-drain output; ADC channel 6
ADC4 terminal block (out)	FET/ADC/DI	53	14 @ CON1	open-drain output; ADC channel 0; digital input
ADC5 terminal block (out)	FET/ADC/DI	2	13 @ CON1	open-drain output; ADC channel 1; digital input
D1 terminal block (out)	FET/DI	248	GPIO6@ LAN9514	open-drain output; "dry contact" input
D2 terminal block (out)	FET/DI	247	GPIO5@ LAN9514	open-drain output; "dry contact" input
D3 terminal block (out)	FET/DI	246	GPIO4@ LAN9514	open-drain output; "dry contact" input
D4 terminal block (out)	FET/DI	245	GPIO3@ LAN9514	open-drain output; dry contact input

GPIOs on terminal blocks

terminal block	function	GPIO #	SoM pin	comments
ADC4 terminal block (in)	FET/ADC/DI	123	GPIO3 @ SC16IS752	open-drain output; ADC channel 0; digital input
ADC5 terminal block (in)	FET/ADC/DI	1	12@CON1	open-drain output; ADC channel 1; digital input
R1 terminal block	GPIO, resistive sensors input	16	19 @ CON1	ADC channel 7
R2 terminal block	GPIO, resistive sensors input	6	17 @ CON1	ADC channel 5 (3.3V pull-up (how?))
W1 terminal block	1-wire/GPIO	52	26 @ CON1	internal pull-up, 1-wire by default
W2 terminal block	1-wire/GPIO	50	25 @ CON1	internal pull-up, 1-wire by default

GPIOs on dry contact inputs

terminal block	function	GPIO #	SoM pin	comments
D1 terminal block (in)	FET/DI	36	7 @ CON1	open drain output; "dry contact" input
D2 terminal block (in)	FET/DI	37	8 @ CON1	open drain output; "dry contact" input
D3 terminal block (in)		FET/DI	38	9 @ CON1	open drain output; "dry contact" input
D4 terminal block (in)		FET/DI	39	10 @ CON1	open drain output; "dry contact" input

GPIOs on relays

Linux GPIO #	SoM pin	comments
33	4@CON1	Relay 2
34	5@CON1	Relay 1

GPIOs for internal use

Linux GPIO
51	27 @ CON1	ADC MUX A
57	22 @ CON1	ADC MUX B
54	21 @ CON1	ADC MUX C
35	6 @ CON1	3.3V rail shutdown
3	12@CON2	sc16is752 chip select
25	27@CON2	IRQ sc16is752
92	24 @ CON2	RFM69H IRQ
4	15 @ CON1	RFM69H chip select
91	25 @ CON2	RFM69H _DIO2
		NRF24L01 chip select
		NRF24L01 enable
120	GPIO0 @ SC16IS752	RS-485 isolated supply enable
124	GPIO4 @ SC16IS752	SIM900R power FET
125	GPIO5 @ SC16IS752	SIM900R power KEY
249	GPIO7 @ LAN951x	SIM900R power status (input)
32	3@CON1	watchdog output
60 / PWM2	28@CON2	Buzzer
126	GPIO6 @ SC16IS752	Red LED
127	GPIO7 @ SC16IS752	Green LED

GPIOs on extension slot

Wiren Board 4

Linux GPIO
55	7 @ CON2	CE	i2c scl, 3.3V pull-up
56	8 @ CON2	CSN	i2c sda, 3.3V pull-up
23	26 @ CON2	IRQ

See also GPIO Howto