HW-0.23-mini

Construction

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/HW-0.22-mini

/HW-0.23-mini

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Construction of the NG Hardware - HW-0.23-mini

HW-0.23-mini PCB Assembling

Undervoltage Protection

The undervoltage protection protects your battery from low voltage (they get permanently damaged if the voltage drops too low). Because we support different battery types you have to choose resistors R2 and R3 according to your battery type.

Typ	LiPo			LiFePo
	Voltage	R2	R3	Voltage	R2	R3
3S	8.1V	150k	12k	8.4V	130k	10k
4S	10.8V	510k	30k	11.2V	120k	6k8
5S	13.5V	430k	20k	14V	270k	12k

You also can leave R5 unpopulated to disable this function.

Cabeling

Plugs

The different plugs on the PCB:

Name	Function	Pins
X1	JTAG Connector	1-TDO, 2-TDI, 3-TCK, 4-TMS, 5-TRST, 6-RTCK, 7-RESET, 8-GND, 9-3.3V, 10-GND
X2	PPM Connector	1-5V, 2-PPM(Input), 3-GND
X3	Beeper	1-GND, 2-5V, R26 bias resistor
X4	GPS Antenna	MMCX Plug
X5	UART0 (3.3V, 5V tolerant)	1-GND, 2-RXD(Input), 3-TXD(Output), 4-5V/3.3V(see SJ1)
X6	UART1 (3.3V, 5V tolerant)	1-GND, 2-RXD(Input), 3-TXD(Output), 4-5V/3.3V(see SJ3)
X7	I2C Actor Bus	1-GND, 2-SDA, 3-SCL, 4-5V
X8	I2C Aux, RC/Cam-Controller	1-6V, 2-6V, 3-5V, 4-3.3V, 5-GND, 6-SCL, 7-SDA, 8-GND
X10	Aux ADC	1-GND, 2-ADC0, 3-ADC1, 4-3.3V
X11	Aux Open Collector	1-AUX-OC, 2-GND

Switches

The different switches on the PCB:

SW1	Power Switch
SW2	Reset / Bootloader
SW3	GPS/RTC Battery Switch

Jumpers

The different jumpers on the PCB (SJ, solder jumper):

Name	Function
SJ1	3.3V/5V UART0 pin 4 voltage (1-2 = 3.3V, 2-3 = 5V)
SJ2	Battery measurement (1-2 = measure)
SJ3	3.3V/5V UART1 pin 4 voltage (1-2 = 3.3V, 2-3 = 5V)
SJ4	3.3V/5V I2C General Purpose Bus signal voltage (1-2 = 3.3V, 2-3 = 5V)
SJ5	SCL for HMC5883L
SJ6	SDA for HMC5883L