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Extra info for Basic analog and digital. Student guide, version 1.2

Example text

First, press and hold the right button. Then press and release the left button. The output should look like Figure 2-5 below. 2. Next, release the right button, and press and release the left button again. The output should change so that it looks like Figure 2-6. 2. Chapter 2: Introduction to Bit Crunching · Page 33 Press and hold the right button, then press and release the left button twice. Then the output should look like Figure 2-7. 2. If your program worked as shown, you just synchronously shifted 4 serial bits into the BASIC Stamp's RAM.

Voutput = Vinput × R2 R1 + R 2 Not surprisingly, it’s called the voltage divider equation, and this technique for scaling down an input voltage is commonly referred to as using a voltage divider. Chapter 3: Basic Analog to Digital Conversion · Page 43 Resistors in Series: A chain of resistors connected end to end. Three resistors in series are shown below. The three resistors can be viewed as a single resistance whose value is: Rseries=R1+R2+R3 R1 R2 R3 The ADC0831 Integrated Circuit - An 8-bit Analog to Digital Converter The ADC0831 is an integrated circuit referred to as an 8-bit analog to digital converter (A/D converter) with synchronous serial output.

The command SHIFTIN D0,CLK,msbpost,[adcBits\8] is a powerful instruction that takes care of all the synchronous serial communication so that we don't have to program it as we did in Chapter #2. In effect, this command sends clock pulses to the ADC0831’s CLK input and reads output bits from ADC0831’s D0 output. This command also loads each of the ADC 0831’s output bits into the adcBits byte. SHIFTIN DataOutput,CLK,MSBPOST,[adcBits\8] The SHIFTIN command is discussed in more detail in the BASIC Stamp Manual, but the general format for the command is: SHIFTIN data_ pin, clock_pin, mode, [variable\bits] In our case, the data pin is DataOutput, a constant equal to the number 2.

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