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Open-source (and open hardware) Arduino-based telemetry and instrumentation module for amateur rocketry
C++
tree: 840b044327

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hardware
ADXL330.cpp
ADXL330.h
Artemis.pde
DS1307.cpp
DS1307.h
DS18B20.cpp
DS18B20.h
MPX4101A.cpp
MPX4101A.h
README.markdown

README.markdown

ARTEMIS: Arduino Rocket Telemetry Module and Instrumentation System

more documentation to come later

(I'm having some trouble learning how to make the markdown code block work properly... ...please bear with me here.)

            Hardware Arduino pin assignments:

            Function                                Mega pin                Duemilanove pin 

            UART Rx from XBee:                      Digital 0 (RX0)         (0) 
            UART Tx to XBee:                        Digital 1 (TX0)         (1) 
            1-Wire (DS18B20)                        Digital 2               (2) 
            Accelerometer (ADXL330) self-test       Digital 3               (3) 

            LDR 1:                                  Analog 0                (Analog 0)
            LDR 2:                                  Analog 1                (Analog 1)
            Battery voltage:                        Analog 7

            UART Tx to GPS module:                  18 (TX1)
            UART Rx from GPS module:                19 (RX1)

            I2C serial data for DS1307 RTC:         20 (SDA)
            I2C clock:                              21 (SCL)

            Atmel DataFlash SPI chip select:        46  
            MCP3204 ADC (5 V) SPI chip select:      47  
            MCP3208 ADC (3.3 V) SPI chip select:    48  

            SPI Master-in-slave-out (MISO):         50  
            SPI Master-out-slave-in (MOSI):         51  
            SPI clock (SCK):                        52  

(Note that pins 20, 21, 50 51 and 52 are hard-wired to the microcontroller's internal hardware for those interface protocols, and cannot be changed.)

Although it is designed to be used with an Arduino Mega, some pins (The DS18B20, the LDRs and the XBee module) can be tested with the board plugged into an Arduino Duemilanove.

On future PCBs it would be nice to change the battery voltage measurement input from Analog 7 to Analog 5, to allow this function to be tested on an Arduino Duemilanove. This was just a little bit of laziness on the part of the PCB designer, since pin 7 is the one closest to that part of the layout.

The accelerometer self-test should be used with caution since it is plugged straight into the microcontroller and the accelerometer is a 3.3V device. Perhaps PWMing it would be appropriate - I should have added a capacitor on this pin on the board to smooth off the PWM.

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