Twog v1

!! WARNING !!

THIS IS A PRELIMINARY DESIGN, IT HAS NOT BEEN TESTED YET.
DO NOT USE FOR MASS PRODUCTION AS LONG AS THIS MESSAGE REMAIN.

Hardware Revision History

Version #	Release Date	Release Notes
v1.00	04/2008	Initial release of Twog v1

Features

Single LPC2148 MCU
8 x Analog input channels 0V - 3.3V (2 channels with optional on-board resistor bridge)
1 x 3.3V TTL UART (5V tolerant)
8 x PWM outputs
1 x R/C receiver PPM frame input
1 x SPI bus
1 x I²C bus
1 x USB (client)
5V/2.5A switching power supply & 3.3V/1A linear regulator
3 x status LEDs with attached test point
?? grams
40.2 x 30.5mm (1.6" x 1.2")
2 layers PCB design, 0603 components

Architecture

Pinout

Pins Name and Type are specified with respect to the Autopilot Board

**SERIAL**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5V	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	DTR
5	CTS
6	RTS
7	RXD1	IN	UART1 Serial Input (3.3V level, 5V Tolerant)	Green
8	TXD1	OUT	UART1 Serial Output (3.3V level)	Blue

**SPI**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from Tiny	Red
3	SSEL	IN	SSP Slave Select. Selects the SSP interface as a slave (SSEL1)	Brown
4	MOSI	I/O	SPI1 Master Out Slave In. Data output from master or data input to slave	Grey
5	MISO	I/O	SPI1 Master In Slave Out. Data input to master or data output from slave	Green
6	DRDY	IN	External interrupt 0 input (EINT0)	Purple
7	SCK	I/O	SPI0 Serial clock. Clock output from master or input to slave	Yellow

**PPM**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5v	PWR	5V Rail from Tiny to R/C receiver supply	Orange
3	PPM_IN	IN	PPM Stream from R/C Receiver (5V tolerant)	White
4	SERV_RST	OUT	external PPM decoder reset (Note 1)
5	SERV_CLK	OUT	external PPM decoder clock (Note 1)

Note 1 : Used only if servos are connected to the R/C receiver

**USB**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from Tiny	Red
3	USB+	I/O	USB bidirectional D+ line	Green
4	USB-	I/O	USB bidirectional D- line	White
5	VBUS	IN	Indicates the presence of USB bus power (P0.23) (5V level)	Orange
6	BUTTON	IN	External Button (+3.3v pullup)
7	LED3	OUT	GPIO (LED #3 command)
8	ADC_7	IN	Analog to Digital Converter Input #7

**IRV**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from Tiny	Red
3	IRV	IN	Vertical IR Sensor signal (Analog to Digital Converter Input #0)	Purple

**IRH**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+3.3V	PWR	3.3V Rail from Tiny	Red
3	IRH_2	IN	Horizontal IR Sensor signal axis 2 (Analog to Digital Converter Input #2)	Grey
4	IRH_1	IN	Horizontal IR Sensor signal axis 1 (Analog to Digital Converter Input #1)	Brown

**ADC1**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5v	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	ADC_4	IN	Analog to Digital Converter Input #4
5	ADC_3	IN	Analog to Digital Converter Input #3

**ADC2**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5v	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	ADC_6	IN	Analog to Digital Converter Input #6 (Maximum input level can be selected with R12 value)
5	ADC_5	IN	Analog to Digital Converter Input #5 (Maximum input level can be selected with R13 value)

**DOWNLOAD/GPS**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5v	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	BOOT	IN	In-Circuit Serial Programming (ISP) enable (P0.14, +3.3v pullup) (Note 2)
5	GPS_RESET	IN	leave unconnected, hold this pin low only for bootloader programming
6	TXD0	OUT	UART0 Serial Output (usable with an external GPS receiver)	Blue
7	RXD0	IN	UART0 Serial Input (usable with an external GPS receiver)	Green

Note 2 : Holding this pin low for at least 3mS after a RESET (or power up) instructs the controller to enter programming mode.

**I2C**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5V	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	SDA	I/O	I2C bus Serial DAta
5	SCL	I/O	I2C bus Serial CLock

**CAM**
Pin #	Name	Type	Description	Suggested Color
1	GND	PWR	common ground	Black
2	+5V	PWR	5V Rail from Tiny	Orange
3	+3.3V	PWR	3.3V Rail from Tiny	Red
4	CAM_SW	OUT	video source/payload selection signal
5	SRV_1	OUT	Servo PWM signal #1
6	SRV_5	OUT	Servo PWM signal #5
7	AUX	PWR	video/payload switchable 5V power suply

Schematic

PCB

PCB top side view (Olimex)
PCB top copper
PCB bottom side view (Olimex)
PCB bottom copper

Gerber & Drill Files

Download Twog v1.00 gerber & drill files (zip)

RS274X, units = Inches, format = 2:5

Twog_v1-00.GTO (Top Component Print Layer)
Twog_v1-00.GTS (Top Solder Mask)
Twog_v1-00.GTL (Top Copper Layer)
Twog_v1-00.GBL (Bottom Copper Layer)
Twog_v1-00.GBS (Bottom Solder Mask)
Twog_v1-00.DRI (NC XY coordinates & Drill tools sizes)

Possible PCB Manufacturers

Assembly

Components Layout

Top components Layout
Bottom components Layout
Top components details
Bottom components details

Bill Of Material

Download Twog v1.00 Bill Of Material (zipped .xls file)