OpenTracker+ SMT pinout list.

All off-board connections are through a double row of holes, in a standard 24-pin DIP footprint. Two pin header strips are provided (not installed) to allow the board to be mated with another PCB or installed in a solderless breadboard.

This board does not include a built-in temperature sensor or LEDs.

Pinout:

Pin	Name	Function
1	5VIN	Regulated 5-volt input
2	RXD	RS-232 data in (from GPS or computer)
3	1WIRE	Dallas 1-wire bus for external sensors
4	AOUT	Audio out to radio
5	ADC5	Analog input
6	T1CH1	Timer channel
7	ADC6	Analog input
8	RST	Reset (active low)
9	ADC7	Analog input
10	IRQ	Transmit-now, profile select, or counter
11	ADC8	Analog input
12	ADC9	Analog input
13	AIN	Audio input from radio
14	ADC4	Analog input
15	ADC3	Analog input
16	TXD	RS-232 data out
17	RED	Red LED output
18	GREEN	Green LED output
19	ADC2	Analog input
20	ADC1	Analog input
21	PTT	Push-to-talk signal to radio
22	REGOUT	Regulator output - 5 volts
23	GND	Ground
24	REGIN	Regulator input - 6.5 to 28 volts

There is no on-board connection between the regulator output and the 5 volt supply. This allows the regulator section to be bypassed if an external 5 volt source is available. To use the regulator, either connect the REGOUT and 5VIN pins externally or place a small blob of solder on the two jumper pads on the bottom of the PCB.

When the telemetry option is enabled, the device will transmit an APRS telemetry packet containing 8-bit analog values for inputs ADC1-5 and digital values for inputs T1CH1 and ADC6-9.