Parts Required

(1) A/D Converter circuit from Chapter 1, from Figure 1-6 and Figure 1-7 (1) 1 kQ resistor (brown black red)

(1) AAA Battery Holder (red wire is +, black wire is -)

(2) 1.2-volt AAA NiCad rechargeable batteries (included)

V Disconnect power to your BASIC Stamp.

V Insert the AAA batteries into the battery holder.

V Add the 1 kQ resistor and battery holder to the circuit shown in Figure 2-1 and Figure 2-2.

This is the same basic circuit we used in the last chapter; here, we'll use it to read the voltage produced by the AAA batteries. The battery voltage is connected to ch0 of the A/D converter via a 1 kQ resistor.

NiCad Batteries

1k Q

ADC0834

P3 O

ADC0834

Figure 2-1

Voltage

Tester

Schematic

Figure 2-1

Voltage

Tester

Schematic

V Run the program ADCtest.bs2.

V Note the COM port being used, then close the Debug Terminal.

V Bring up the StampPlot screen using the sic_ewre_basic macro, and set the COM port to the one you just noted.

V Click on the Connect button, making sure that the Enable Plotting box to the right is also selected.

You should see a line plotted across the screen, representing the voltage of the AAA batteries.

V Read the value from the graph, and write it in the space below:

AAA Batteries Initial Voltage: _

In the next experiment, you will build a programmable battery charger. If your batteries measure less than 2.0 V, then they will take a charge. However, if the batteries measure 2.0 V or greater, they don't need charging. In this case, they'll be discharged before they can be charged.

DIY Battery Repair

DIY Battery Repair

You can now recondition your old batteries at home and bring them back to 100 percent of their working condition. This guide will enable you to revive All NiCd batteries regardless of brand and battery volt. It will give you the required information on how to re-energize and revive your NiCd batteries through the RVD process, charging method and charging guidelines.

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