Drone control hardware

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Flight controller

Version 1.2 schematic and PCB-layout. Sonar height is connected to RX4 same pin as A12 (marked as A12 on board) and 5V. Angle IMU for motor angles are GY91 boards connected to I2C-2, using pin 3 (SCL) and 4 (SDA) marked on board as ESC 1 (SCL) and ESC2 (SDA), both on 3.3V from pins marked A13 and 3.3V. Current measurements are not used (one is shorted). ESC 1 and 2 are moved to ESC 7 and 8.

Prop Shield

From: https://www.pjrc.com/store/prop_shield.html

Signal	  Pin #	Used By:	Description
SDA	  18	sensors	I2C Data for motion sensors
SCL	  19	sensors	I2C Clock for motion sensors
IRQ	  2	sensors	Interrupt from motion sensors
MOSI	  11	memory,led	SPI Data
MISO	  12	memory	SPI Data
SCK	  13	memory,led	SPI Clock
MEM_CS	  6	memory	Low to access memory
LED_EN	  7	led	High to send LED data
LED_DAT  -	led	5v buffered LED Data output
LED_CLK  -	led	5v buffered LED Clock output
AMP_EN	  5	amp	High to enable amplifier
AudioIN  DAC	amp	Audio signal
AudioGND AGND	amp	Audio ground
Speaker+ -	amp	Connect a 4Ω or 8Ω speaker
                       Twisted pair wire is recommended
Speaker  -	-	amp
5Vpower  VIN	amp,led	
3Vpower  3.3V	sensors,memory	
GND	  GND	(all)

Schematic

Sensor board

Servo power board

Interface and power board for servos. PWM 1..4 is powered from one 5V buck converter. The other 5V buck converter is available on the 2x3 pins bottom right on PCM figure.

Power distribute

Power distribution from 2 batteries in parallel using XT60, all output sockets are XT30.