Gw12 prototypes

First home-built probes look like:

Connectors

Top White Connector

From right to left.

Sensor1 Connector

Pin	Name	Details
1	VDD_SENSORS	Sensors 3.3V Supply
2	GND	6
3	Pressure+	9
4	Pressure-	12
5	Resistance	15
6	Resistance_Offset	15

Top Left Through-hole Connector

Pins are numbered from Left to Right

Debug & Programming Connector

Pin	Name	Details
1	GND	Conencted to common ground
2	VDD	Connected to MCU 3.3V
3	!RESET	Inverting Reset: High=Active, Low=Reset
4	SWO	Single Wire Output for Advanced Debugging
5	SWCLK	Single Wire Clock
6	SWDIO	Single Wire Debug Input/Output

Bottom Left Through-hole Connector

Pins are numbered from bottom right to upper left. There are a couple of problems here, as all the signals are 3.3V Logic, while the radio is driven with a 5V Supply. Must investigate whether all these lines are neccessary

Radio Connector

Pin	Name	Details
1	GND	Blahde blah
2	VDD_RADIO	5V Radio Supply Signal
3	RADIO_RESET
4	RADIO_TX	12
5	RADIO_CTS	15
6	RADIO_RX	15
7	RADIO_SETUP	15
8	RADIO_WAKE_DIR	15

IC's counter-clockwise from top left

• HMC5883 Compass
• MMA 8450 Accelerometer
• EFM32G230F128
• LTC2935 Voltage Supervisor
• LP5951 3.3V LDO (MCU Voltage Plane)
• LP5951 3.3V LDO (Sensors enable Sensors Plane)
• TPSsomething-something Boost Reg
• REG113 LDO smoothing reg

Other devices on board:

• microsd card slot
• 3 colour led
• 2x Tactile Buttons

IC's around board

• 3x INA333 Instrumentation Amps
• Analog switch (bottom)
• OPA2333 Operational Amplifiers
• Power Switch

Photos of the boards in Production

GW12.0 MCU Board Top Layer

GW12.0 MCU Board Bottom Layer