/HW-0.23-mini |
Construction of the NG Hardware - HW-0.23-mini
Contents
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 |