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Extra info for Circuit Cellar (June 2003)

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As a result, the MCU’s average consumption is minuscule. The design uses five interrupts: levelchange interrupts on ports 1 and 2, basic timer and watchdog timer interrupts, and a UART receiver interrupt. The WDT is used as an interval timer for 1 s; it provides time-keeping functions if the device is in Monitor mode. Also, if the function is provisioned, it SOFTWARE DESIGN I wrote the software in C with an evaluation version of an IAR compiler. It was limited to 4 Kb of compiled code, which was sufficient for this project.

The copper base for the sensor array is made up of the copper disc and sensor pads; it was fabricated from a single piece of copper to ensure the even heating of all eight pads. A 10-Ω, 10-W resistor serves as the heating element for the sensor. It was sheathed in copper and placed vertically through the center of the copper circle. Holes were drilled in the center of each of the copper pads to accommodate a thermistor lead. For each thermistor, one of the leads was passed through the hole and soldered to the backside of the copper pad.

You must install an in-line fuse between two of the series batteries. Do not put the fuse between the battery and the load, because at some point you’re going to measure the battery voltage with a multimeter set for current. The ensuing FAP! will—depending on your luck—blow the meter’s fuse or currentsensing resistor, metal-plate the inside of the case with vaporized PCB traces, or burn off the probe wire insulation. The front panel in Photo 2 holds two additional fuses, one for the AC input to protect the transformer and the other on the output to protect the charger.

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