Signal Tester

A side project for testing serial RGB LEDs (WS2182B ) and for testing and positioning Servos. It also has a feature to try different PWM levels for a simple LED connection. It's powered from 3 AAA batteries, with a simple OLED display, 3 analog inputs and 3 buttons for navigation. Settings can be saved into EEPROM, which can be reviewed at a later date. It uses an STM32F042F which is a TSSOP20 device and is all fitted onto a board 5.5cm x 4.5cm.

Pin Functions

The pin functions are:

Pin	Function	Type	Description
1	BOOT0	I/P	Tied to ground
2	PF0	I/O	I2C SDA
3	PF1	I/O	I2C SCL
4	NRST	RST	SWD - RST
5	VDDA	S	3.3v power supply
6	PA0	I/0	(Analog) Blue Input
7	PA1	I/0	(Analog) Green Input
8	PA2	I/0	(Analog) Red Input
9	PA3	I/0	Not Used
10	PA4	I/0	(OUT) Display #RESET
11	PA5	I/0	Not Used
12	PA6	I/0	Not Used
13	PA7	I/0	(IN) Button Back
14	PB1	I/0	(OUT) Signal/Servo Output
15	VSS	S	Ground
16	VDD	S	3.3v power supply
17	PA9	I/0	(IN) Button Action
18	PA10	I/0	(IN) Button Forward
19	PA13	I/0	SWD - SWDIO
20	PA14	I/0	SWD - SWCLK

Other notable ICs

Other notable IC's on the board

Device	Description
24AA16	16K I2C Serial EEPROM
ER-OLED010-1	OLED 1" Display

Schematic

Click on the image above for a PDF version.

Board Layout

The top of the board.

The bottom of the board (although top when used).

Populated board, with prototype 4 signal head connected.