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- Circuit diagram of parallel to serial converter code#
- Circuit diagram of parallel to serial converter series#
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In this example you'll add a second shift register, doubling the number of input pins while still using the same number of pins on the Arduino.
Circuit diagram of parallel to serial converter code#
P/S C (pin 9) to Ardunio DigitalPin 8 (green wire)įrom now on those will be refered to as the dataPin, the clockPin and the latchPin respectively.Ĭode Sample 1.1 Hello World Code Sample 1.2 What is Pressed? Code Sample 1.3 Button Combination Check Code Sample 1.4 Is it pressed? (sub-function) Example 2: Multiple Shift Registers Q8 (pin 3) to Ardunio DigitalPin 9 (blue wire)ĬLOCK (pin 10) to to Ardunio DigitalPin 7 (yellow wire) The first step is to extend your Arduino with one shift register. Q8 is the only one used in these examples.ĭC supply voltage Example 1: One Shift Register Q7 is a pulse behind Q8 and Q6 is a pulse behind Q7. Serial Output Pins from different steps in the sequence. There is more information about shifting in the ShiftOut tutorial.īefore you start wiring up your board here is the pin diagram of the CD4021 from the Texas Instruments Datasheet PINS 1,4-7, 13-15 Switch -> | 0 | switch -> | 2 | switch -> | 1 | |_ | < - Latch Data from Arduino Switch -> | | switch -> | C | switch -> | D | switch -> | 4 | -> Serial Data to Arduino Tell the register the Arduino is ready to get the information serially (latch pin LOW)įor each of the inputs that are to be read, pulse the clockPin and check to see if the data pin is LOW or HIGH Make sure the register has the latest information from its parallel inputs (i.e. The pseudo code to coordinate this all looks something like this: That means every time the latch pin transitions from HIGH to LOW the shift register will start passing its most current switch information. When the latch pin is LOW, it listens to the clock pin and passes information serially. When the latch pin is HIGH the shift register is listening to its 8 parallel inputs. The third pin attached to the Arduino is a "Parallel to Serial Control" pin. Every time the Arduino changes the clock pin from LOW to HIGH the shift register changes the state of the Serial Output pin, indicating the value of the next switch. The clock pin is the metronome of the conversation between the shift register and the Arduino, it is what keeps the two systems synchronous. Synchronous Serial communication, either input or output, is heavily reliant on what is referred to as a clock pin. The transfer of information on the data pin is called "Synchronous Serial Output" because the shift register waits to deliver linear sequence of data to the Arduino until the Arduino asks for it. This pin should be connected to an input pin on your Arduino Board, referred to as the data pin.
Circuit diagram of parallel to serial converter series#
The 8 inputs are translated into a series of HIGH and LOW pulses on the serial-out pin of the shift register. "Asynchronous" because the CD4021B is doing all this data collection at its own pace without coordinating with the Arduino.
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"Parallel" because it is all at once, like hearing a musical cord. "Input" because you are collecting information. This is called Asynchronous Parallel Input. This means you can read the state of up to 8 digital inputs attached to the register all at once. Using a parallel to serial shift register you can collect information from 8 or more switches while only using 3 of the pins on your Arduino.Īn example of a parallel to serial register is the CD4021B, sometimes referred to as an 8-Stage Static Shift Register. Sometimes you'll end up needing more digital input than there are pins on your Arduino. Parallel to Serial Shifting-In with a CD4021BE Shifting In & the CD4021B