Tiny v2

Features

• Single LPC2148 MCU
• 8 Analog input channels 0V - 3.3V (2 channels with optional on-board 5v -> 3.3v resistor bridge)
• 1 3.3V TTL UART (5V tolerant)
• 8 PWM outputs
• 1 R/C receiver PPM frame input
• 1 SPI bus
• 1 I²C bus
• 1 USB (client)
• Integrated GPS receiver and patch antenna (4Hz update)
• 5V/2.5A switching power supply & 3.3V/1A linear regulator
• 3 status LEDs with attached test point
• ?? grams
• 70.8 x 40mm (smaller then a banking card)
• 2 layers PCB design, 0603 components

• 

  Tiny v2.1 top side view (13mm GPS antenna)

• 

  Tiny v2.1 bottom side view

The Tiny v2.1 autopilot uses a single Philips LPC2148 ARM7 based microcontroller. The ARM7 is a low-power 32-bit RISC processor core and the Philips LPC2148 has 512KB on-chip Flash ROM, 40KB RAM and can be clocked at 60MHz.

Although critical control code such as the R/C interface and servo output are well segregated in Paparazzi software and well protected from interference from flaws in the stability/navigation/comm/payload code, great care must be taken when experimenting with new software as some errors can cause a the processor to halt or stall for extended periods causing total loss of control.

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)	Braun
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	ADC_2	IN	Horizontal IR Sensor signal axis 2 (Analog to Digital Converter Input #2)	Grey
4	ADC_1	IN	Horizontal IR Sensor signal axis 1 (Analog to Digital Converter Input #1)	Braun

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 & R14 values)
5	ADC_5	IN	Analog to Digital Converter Input #5 (Maximum input level can be selected with R13 & R15 values)

DOWNLOAD

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 (Note 3)
6	TXD0	OUT	UART0 Serial Output (shared with GPS receiver)	Blue
7	RXD0	IN	UART0 Serial Input (shared with 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.

Note 3 : MAXIMUM VOLTAGE ON THIS PIN : 1.95V !!!

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

• 

  Tiny v2.1 Schematic

PCB

• 

  Tiny v2.1 PCB top side view (Olimex)

• 

  Tiny v2.1 PCB bottom side view (Olimex)

Assembly

• 

  Tiny v2.1 top components Layout

• 

  Tiny v2.1 bottom components Layout

• 

  Tiny v2.1 top components details

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  Tiny v2.1 bottom components details