Testing plate for AVR v1.1 microcontrollers

[Vermes]

It is a project of a testing plate for AVR. The whole system consists of two sub-systems: uC Programmer and main testing plate.
Construction of main testing plate:

• slot for connecting various adapters with uP
• LCD display 2*16 characters + transistor key for controlling backlight (eg PWM)
• two dual 7-segments displays + seconds LEDs
• transmitter (IR) and IR receiver (TFMS)
• slot for connecting mini-adapters to operational amplifiers, etc. (derived power supply 5V, 9V and few lines connected with adapters with uP)
• 8-bit LED bar
• keyboard 4x4 + additional line connected to INTx uP
• A/D D/A PCF8591 (I2C)
• EEPROM (I2C)
• power implementing systems ULN2803 and TD62786 (NPN and PNP tips)
• real-time system PCF8583 (I2C)
• bi-directional converter I2C/8-bit PCF8574
• 1-wire connector
• adapters → Atmega8, Atmega16/32, Attiny2313 (with descriptions of pins)

Construction of uC Programmer:

• USBasp programmer connected to the main plate and adapter slot
• additional USB port
• PS2 port
• converter MAX232 → connected to the main plate and adapter slot
• two I/O ports (DB15), which enable to connect a second system of test plate or I/O card with executive power systems
• programming multiplexer → allows to switch ISP signals from the main plate to I/O card to program another uP
• additional bidirectional port (DB15) I/O ↔ I2C with PCF8583 system
• piezo buzzer
• external power supply +5V/+12V + stabilizer on plate + 9V (WO power)

The whole is made in so called 'sandwich' with headers. The system is mounted in housing Z-33. chips were used in DIP housings due to the possibility of easy change (each one is placed in the stands). Discrete components (resistors, capacitors, transistors, jumpers, etc.) in SMD housings (1206, etc.) were used and put on the bottom of the plate. PCB were done in Protel99SE.
Presentation:
Main plate:



uC Programmer:



The whole system:



Adapters:



It is an old project. Some modifications could be a good idea:

• plate would be 2- or 4-layer, ordered in a company performing PCB
• fully SMD technology, 0603 housings, etc.
• pulse converters +3,3V/+5V integrated with the plate
• converter USB/RS232 → FT232
• SD card slot
• graphical display, such as Nokia 3510i
• radio adapters
• much thinner signal paths
• processor adapters ARM CORTEX etc. LPC1343 + drivers I/O 3,3/5V

Link to original thread – Płytka testowa mikrokontrolerów AVR v1.1