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Labeled the cool table at the Arduino workshop. From left to right: Chris Lokhart, Hilton Tennent, James Carol, Andrew Spitz hiding behind Pippa Tshabalala.
Detail of the power stages.
I used TO-220 N-channel MOSFET transistors but to prevent the return ground from being broken up via through holes the transistor legs were cut short and soldered to the top layer pad.
Also, the drain tab is soldered to a large thermal pad on the top layer with no through hole for the mounting bolt. Therefore all the transistors have their drain tabs soldered to the top layer.
N-Channel MOSFETS were used due to their lower on resistance. In the case of these devices the quoted on resistance is 9 mOhms each.
As the MOSFETs are N-Channel they require the gate voltage to be higher than the source to turn on. But the transistors are used to switch the high side, 100V input from the solar panels. Therefore a charge pump arrangement was designed to pump the gate to ~8V above the source (10V less 2x diode drops).
On the right hand side of the board is the 100V to 10V flyback PSU. A local 5V linear regulator supplies the current monitor devices and feeds 5V up to the MCU controller to power the Arduino and logic circuitry.
This workshop introduced beginners in physical computing to the Arduino environment. We provided them with a pre-made program to control a servo motor and taught them how to read the program and adjust values to move the servo. In addition, they learned the basics of electronics and how to connect a servo to an Arduino board.
We were trying to build a very simple robot able move towards the light.
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the workshop's wiki report:
This setup uses an Arduino Uno, a 16x2 liquid crystal display, a 10k thermistor, and a real-time clock. Pictured but yet to be connected is a common cathode RGB LED.
I bough an new Arduino Duemilanove that come with an extra resistor. This resistor need to be removed to Arduino serial works
Denden-town Electronic construction classroom
Nippon-bashi, Osaka
arduino.sugakoubou.com/arduino%e3%83%95%e3%82%a1%e3%83%b3...