Home

Prototyping board

Built to be a transmitter or receiver

Requirements

• 5 Pin SWD interface
• 5 Pin seven segment display interface
• 1 Serial out Debug Pin
• Recommended power Regulator
  • Can be powered by a Coin Cell or external power.
• RFM69
• Antennas (switch between either with jumpers or 0 ohm resistor)
  • Trace Antenna
  • Wire antenna
  • External directional antenna
• Interface for an External Buzzer
• Power switch
• Reset button
• LEDs

Seven segment board

Requirements

• 5 pins
  • Vcc - Power in 2-6V
  • Gnd - Ground
  • SER - Serial In
  • SRCLK
  • RCLK
• 32 resistors
  • 0402 330 Ohm
• 4 8-bit Shift Registers
  • OE tied to power, CLR tied to GND
  • Tie QH to inputs in sequence
  • http://www.ti.com/lit/ds/symlink/sn74hc595b.pdf
• 4-digit seven-segment display:
  • https://octopart.com/ldq-a512ri-lumex-548693

Transmitter board

Requirements

• LPC824
• Program and debug
  • 5 pin SWD
  • 1 Serial Out Debug
• Antenna
  • Wire or Trace?
• Battery powered
  • Coin cell 3.3V
  • Power Regulator
• Power switch
• Reset button
• LEDs
• Buzzer

Receiver board

Just use Prototyping board

• Directional antenna
  • This one? http://www.flytron.com/antennas-filters/125-900mhz-3-element-yagi-antenna.html
• Use Seven Segment board to display ssi
• Battery Power?

RadioHead Code Modifications

• Added "#ifdef TARGET_LPC824 #define SPI_MOSI D11 #define SPI_MISO D12 #define SPI_CLK D13 #else #define SPI_MOSI PB_15 #define SPI_MISO PB_14 #define SPI_CLK PB_13 #endif SPI _SPI(SPI_MOSI, SPI_MISO, SPI_CLK);" to RHHardwareSPI.cpp
• and "#define RH_PLATFORM_MBED 11" to RadioHead.h