Main Controller Board
using AVR u-Processor

Overview

This is the main controller board.
It contains an AVRcontroller that can be programmed through the header. It has a buzzer for user notification.
There are two output MOSFETs for staging or ejection charges.
It has a header on one side that allows stacking.
The board measures 1" x 2".

All arming and ejection charge connectors are on the wireing harness board. This allows easy removal and installation because all wiring goes through the harness board.

To optimize the onboard UART the crystal frequency needs to be 7.3728MHz.
 
This board will be used even with PIC based designs. It will be used as a dedicated download board since the UART can run at high speeds.
Controller

I wanted to bring down the cost of the parts for the controller so I checked into using different parts to bring down the cost. I also removed the EEPROM from the board because I ran out of room because I used a larger buzzer.

Trace Patterns


Here is the PDF for printing

Detailed parts list

Low cost AVR Controller
Supplier Part Number Manufacturer Part Number Price Qty Total Supplier Description
AT90S2313-10SC-ND AT90S2313-10SC $3.66 1 $3.66 Digi-Key AVR microcontroller
83F6060 MIC5205-5.0BM5 TS $1.09 1 $1.09 Newark 5V regulator
06F8355 IRF7101 $1.71 1 $1.71 Newark SO-8 MOSFET N-CHANNEL 3.5A
94B3138 AST100 $1.97 1 $1.97 Newark Buzzer
H2045-ND DF11-16DS-2V(20) $1.68 1 $1.68 Digi-Key Surface Mount Vertical Socket
H2056-ND DF11-16DP-2DSA(20) $0.59 1 $0.59 Digi-Key Verticle Protected Header
263-10K XICON $0.08 3 $0.24 Mouser 1206 SMD 10k resistor
263-100K XICON $0.08 2 $0.16 Mouser 1206 SMD 100k resistor
263-47K XICON $0.08 2 $0.16 Mouser 1206 SMD 47k resistor
77-VJ12V16V105Z VJ1206V105ZXJMT $0.33 1 $0.33 Mouser 1206 SMD 1.0uF capacitor
140-CC501B104K XICON $0.14 1 $0.14 Mouser 0805 SMD .1uF capacitor
74-293D16V10 293D106X9016C2T $0.97 1 $0.97 Mouser 10uF TANTALUM SMD CAPACITOR
140-CC501N270J XICON $0.084 2 $0.17 Mouser 0805 SMD 27pF capacitor
559-FOXSD073-20 FOXSD/073-20 $0.69 1 $0.69 Mouser SMD CRYSTAL 7.3728 MHZ
Total Cost $13.56

 
 


Mail to Robert DeHate