Home

Overview

Uplinks

• Change downlink period
  • By making this a large value, this meets the requirement to stop downlinking completely
• No-op

Downlinks

• ChipSats shall not downlink at the same time. One ChipSat will have an initial delay to make the ChipSats offset.
• ChipSats shall stop downlinking if they have not received an uplink in over 24 hours. This requirement is met by using an alive time counter which is NOT stored in EEPROM. If alive time exceeds 24 hours, downlinking is disabled.
• Downlinks are always the same length. If a sensor fails, those sensor values are 0.

T&C Overview

• downlink period only resets upon successful downlink

Programming Wiring

Wirings are from ChipSat -> Arduino

SPI Programming

Arduino 1 (For uploading code)

• SCK -> Pin 13
• MI(SO) -> Pin 12
• MO(SI) -> Pin 11
• RST -> Pin 10
• VCC -> 5V
• GND -> GND

Arduino 2 (For serial output, make sure to use same ground)

• TX -> TX
• RX -> RX

Serial Programming

• TX -> TX
• RX -> RX
• RST -> RESET
• VCC -> 3.3V
• GND -> GND

Uploading Code to ChipSats

1. Configure the programmer

1. Make sure "Tools > Programmer > Arduino as ISP" is checked
2. Set the target board to Arduino Uno
3. Load the program "Examples > 11.ArduinoISP > ArduinoISP"
4. Upload this program to the Uno

Using Arduino IDE

2. Configure the target

1. Follow the instructions of step 3 of the tutorial here to add the MiniCore library to the Arduino IDE
2. Set the target board to "MiniCore > ATmega328"
3. Ensure the variant is "328P / 328PA"
4. Burn the bootloader onto the ChipSat from "Tools > Burn Bootloader"
5. Upload ChipSat code using "Sketch > Upload Using Programmer"

Using PlatformIO

Note that if this is your first time uploading code to the ChipSat, you must complete the Arduino IDE steps above before you can use PlatformIO.

2. Upload to target

1. Upload using the "program_via_ArduinoISP" environment

Helpful Links

Use Arduino as ISP to Burn Bootloader on AVR Microcontrollers

Programming an AVR ATmega328P with an Arduino.pdf