HamShield Pinouts

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The HamShield makes use of a specialized serial interface to control the radio transceiver as well as two audio input/output pins. The rest of the pins are freely available for other Arduino integrations.  Additionally, direct access to the AT1846S GPIO lines are provided, as well as access to all of the TRRS pins. The TRRS access header is useful for our TRRS Crossover Kit, which can be used to connect HamShield to a computer, smart phone, or even another HamShield.

Arduino Pins

Pin	Description	Purpose
A1	nCS	Radio chip select
A2	SPKR	"Speaker" from radio, analog into Arduino
A3	RST	Radio reset
A4	DAT	Serial data transmit/receive
A5	CLK	Serial clock
D2	Button	Aux button on HamShield (can be used for any purpose)
D3	MIC	PWM audio output from Arduino to Hamshield "microphone"
VIN	DC Barrel	DC barrel input, needs to be 6VDC+ (ideally 9VDC)
5V	5 Volt	5 Volt from Arduino
GND	GND	Grounds

GPIO Pins

Pin	Description	Purpose
1	VCC	Accessory Power
2	GPIO0	Unused
3	GPIO1	Unused
4	GPIO2	Unused
5	GPIO3	Unused
6	GPIO4	Used for RF switch
7	GPIO5	Used for RF switch
8	GPIO6	Unused
9	GPIO7	Unused
10	GND	Ground

 

GPIOs can be configured for a variety of functions, including COR, CTCSS detection, and more! For a detailed description on using the more advanced GPIO functions on HamShield and HamShield Mini, visit our AT1846S GPIO guide.

TRRS Header

The TRRS header allows direct access to the TRRS connector as well as all of the HamShield audio. 

Pin	Purpose	Description
1	Mic	Microphone on TRRS headphone connector
2	Speaker	Right speaker on TRRS headphone connector
3	NC	Left speaker on TRRS headphone connector
4	GND	Ground

 

Pro Tip: Bridging pin 2 and 3 will allow binaural audio -- putting audio into both left and right headphone speakers! However, this will result in a decrease in total audio volume, as the power is split across two speakers.