Many moons ago, before I knew anything about Arduino, I bought a “minimum ATmega kit” from eBay, pretty much like this, DIY ATMEGA8 Minimum System Board ATmega48 ATMEGA88 Minimum System Board AVR Kit. It arrived, I built it, I put in in a box and forgot all about it until today, when I came across it.
But once you’ve made it how can you use it and what are the buttons for?
The description states
Specification:Voltage: USB female or pin header power supply, the supply voltage and the same chip voltageCrystal: 8MPCB board size: 7.4cm * 3.4cmFeature:1. Classic ATmega8 / ATMEGA48 the smallest system2. 23 IO leads to facilitate expansion3. Standard ISP download interface (board does not need a separate power supply, support ISP download interface power supply), to facilitate program download and debugging;4. Support chips: ATMEGA8, ATMEGA48 and pin-compatible chip5. With a self-locking switch, you can flexibly control the system USB input6. Flexible and diverse power supply: available ISP download port power supply, the standard USB interface can be used for power supply, can also be used for power pin row.7. External expansion 3 channel VCC, GND8. Reset: Power-on reset and button reset9. Expansion 1 channel led lights, easy to debug usePackage includes:1 x PCB board1 x 28P locking seat1 x USB1 x DC3-10 horns seat1 x 8 * 8 self-locking switch1 x 40P pin header1 x 8M crystal2 x 22P ceramic capacitors2 x 104 ceramic capacitors2 x 3MM red LED1 x 6 * 6 button2 x 4.7K resistor1 x 10K resistor
- The USB can not be used for programming, only power.
8*8– it appears to switch the USB power.
- The small push button
RESTis the reset button.
LED1is connected to pin 2,
POWLED is the power indicator
- 8 MHz crystal
Other Minimal variations
- 51 avr mcu minimum system board development board learning board stc minimum system board microcontroller programmer, £1.20
- IO mouth all leads, classic 51 minimum system, saves on the welding
- Integrated 10 p ISP download interface, convenient download AT89S52 single chip microcomputer.
- The welding is round hole socket, convenient change crystals (default with 11.0592 M)
- Support chips: STC89C52 STC12C5A60S2 STC11/10 x series of AT89S52 and compatible with the chip pins of the chip
- A power switch, convenient experiment.
- Two ways: power input DC – 005 power source (supporting seat is 5.5 * 2.1) and single needle (next to the power switch)
- Outside enlarge VCC 3 road, GND, as shown in figure out the needle.
- P0 mouth wear resistance.
- Reset method: external and reset button reset on electricity.
- Adopt green IC lock, convenient replacement chips.
- Our independent development, production, supply long-term stability.
- The board size: 4.1 cm * 8.9 cm