RC PWM Signal to Stepper Pulse Generator

Rajkumar Sharma
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moderate
Tested
SKU: EL150101
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This simple Arduino compatible project reads an RC PWM signal (1000μs to 2000μs) and provides 0 to 500Hz pulse output to drive a stepper motor. Step and Direction outputs are open collector types 5V signals. Both signals can directly drive LEDs of optocoupler of stepper drivers. The board consists of ATMEGA328 chip and 2 x BC847 transistors. The transistor helps drive the optocouplers.

Arduino Code

A sample Arduino code is available to test the project.

Burn the bootloader and Arduino code into the new ATMEGA328 microcontroller using an onboard programming connector. Refer to the bootloader and Arduino programming diagram for Connections.

Credits: This is modified code, original code written by: Brandon Tsuge (theboredrobot.com)

Bootloader information: https://docs.arduino.cc/retired/hacking/software/Bootloader/

Arduino Bootloader and Arduino Programming: https://docs.arduino.cc/built-in-examples/arduino-isp/ArduinoToBreadboard/

Features

Power Supply 5V DC @ 30mA
Outputs are Capable to Drive 5V TTL Load (Step/Dir)
Outputs are Open Collector Type
RC PWM Signal Range 1000μs To 2000μs
Output Frequency 0 to 500Hz
On Board Header Connector for Bootloader and Arduino Programming
Very Small Board
PCB Dimensions 30.32 x 25.72mm

Connections

CN1: Pin 1 5V, Pin 2 = Step Pules Output, Pin 3 = 5V, Pin 4 = Dir
CN2: Do Note Install (Can be configured as Limit Switch)
J1: RC Signal Input, Pin 1 = RC Signal Input, Pin 2 = VCC, Pin 3 = GND
J2: Do Note Install (Can be configured as Limit Switch)
CN3: Programming Connector Pin 1 = TX, Pin 2 RX, Pin 3 Reset, Pin 4 = GND, Pin 5 = VCC/5V, Pin 6 = D11, Pin 7 = D12, Pin 8 = D13
D1: Power LED

Schematic

Parts List

NO.	QNTY.	REF,	DESC.	MANUFACTURER	SUPPLIER	SUPPLIER PART NO
1	1	CN1	4 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5317-ND
2	6	U2,J2,CN2,U3,R4,C4	DNP			DO NOT INSTALL
3	1	CN3	8 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5321-ND
4	2	C1,C8	10uF/10V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
5	3	C2,C3,C5	0.1uF/50V CERAMD SIZE 0805MIC	YAGEO/MURATA	DIGIKEY
6	2	C6,C7	22PF/50V CERAMIC SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
7	1	D1	LED SMD SIZE 0805	OSRAM	DIGIKEY	475-1278-1-ND
8	1	J1	3 PIN MALE HEADER PITCH 2.54MM	WURTH	DIGIKEY	732-5316-ND
9	1	J3	SOLDER JUMPER-PCB			NO USE
10	2	Q1,Q2	BC847	NEXPERIA	DIGIKEY	1727-2924-2-ND
11	1	R1	1K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
12	1	R2	10K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
13	2	R3,R6	2.2K 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
14	1	R5	1M 5% SMD SIZE 0805	YAGEO/MURATA	DIGIKEY
15	1	U1	ATMEGA328TQPF-32	MICROCHIP	DIGIKEY	ATMEGA328PB-AURCT-ND
16	1	X1	16Mhz	ECS INC	DIGIKEY	X1103-ND