Difference between revisions of "MiniMexle"
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USB programmer, both in the form of the kit. Both programmer and the board are available from the | USB programmer, both in the form of the kit. Both programmer and the board are available from the | ||
[http://www.minimexle.de/ www.minimexle.de], all documentation is there. | [http://www.minimexle.de/ www.minimexle.de], all documentation is there. | ||
| + | |||
| + | |||
| + | |||
| + | == Building == | ||
| + | |||
| + | Although on the Mexle website You can find the complete step-by-step manual of the board | ||
| + | population, we present here our ideas. Instead of building the whole board on the one step, | ||
| + | we start with the blocks, which can work independently. | ||
| + | |||
| + | First we start to build power supply (i.e. C1-C4, R2, D1, D2, LED, connector X1, test pins | ||
| + | and power supply stabilizer 7805). If You plan to use this board on battery powered applications, You | ||
| + | can immediately replace 7805 stabilisator with low-drop version e.g. National Semiconductor | ||
| + | LM2940CT-5.0. | ||
| + | |||
| + | After completing test the power supply immediately. See the Fig. 20 and 21 in the | ||
| + | [http://www.minimexle.de/shop/pub/Bauanleitung%20MiniMEXLE%20V3.0.pdf manual] to | ||
| + | find all the points where the voltage should be measured. | ||
| + | |||
| + | <span style="color: red">Error: The +5V is on the wrong pin in the Fig. 20 manual v3.0.</span> | ||
| + | |||
| + | |||
| + | Next step is to populate board with the all necessary power filter capacitors, reset circuit and | ||
| + | an oscillator circuit together with a processor socket. Also the connectors SV1 (ISP Programmer) | ||
| + | and SV2 (processor pins) are on the place. | ||
| + | Without processor on the place test the function of the Reset circuit. | ||
| + | Then You can insert the processor and using the AVR-USB-PROGI You can check if the programmer | ||
| + | is able to read configuration fuses and device signature. | ||
| + | If Yes, then the board is good and You can finish the board population. | ||
| + | |||
| + | <span style="color: red">Error: The jumper labeled SJ3 on the board is labeled SJ2 in the | ||
| + | schematic diagram on p. 7 in manual v3.0.</span> | ||
Revision as of 11:17, 28 January 2008
Minimexle is an universal development board for Atmel AVR microprocessor ATmega88, which comes with an USB programmer, both in the form of the kit. Both programmer and the board are available from the www.minimexle.de, all documentation is there.
Building
Although on the Mexle website You can find the complete step-by-step manual of the board population, we present here our ideas. Instead of building the whole board on the one step, we start with the blocks, which can work independently.
First we start to build power supply (i.e. C1-C4, R2, D1, D2, LED, connector X1, test pins and power supply stabilizer 7805). If You plan to use this board on battery powered applications, You can immediately replace 7805 stabilisator with low-drop version e.g. National Semiconductor LM2940CT-5.0.
After completing test the power supply immediately. See the Fig. 20 and 21 in the manual to find all the points where the voltage should be measured.
Error: The +5V is on the wrong pin in the Fig. 20 manual v3.0.
Next step is to populate board with the all necessary power filter capacitors, reset circuit and
an oscillator circuit together with a processor socket. Also the connectors SV1 (ISP Programmer)
and SV2 (processor pins) are on the place.
Without processor on the place test the function of the Reset circuit.
Then You can insert the processor and using the AVR-USB-PROGI You can check if the programmer
is able to read configuration fuses and device signature.
If Yes, then the board is good and You can finish the board population.
Error: The jumper labeled SJ3 on the board is labeled SJ2 in the schematic diagram on p. 7 in manual v3.0.
