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Psoc creator receiving string data12/2/2023 ![]() – Double click the ADC_SAR_1 component on your schematic to adjust its settings. Y(t) = -V_ref, e(t) ADC folder in the component view. – The error is fed into a 1-bit voltage comparator (quantizer) which outputs: – First, from the analog signal an estimate x̂(t) is subtracted to calculate an error signal e(t) = x(t) - x̂(t). ![]() The error signal is fed into a voltage comparator, which compares the error signal to GND (0 V) and produces an output signal y(t), which is either V_ref or -V_ref. The feedback signal is subtracted from the input signal x(t) to generate an error signal e(t) = x(t) - x̂(t). The feedback path contains an integrator, which integrates the output signal to create a feedback signal x̂(t). ![]() The Delta-Sigma ADC is based on a delta modulator-a feedback control system that produces an output signal from an input signal. – Slower speed at high accuracies due to the need to compare many values. – Can be built for high-resolution applications. – The controller then adjusts the output of the DAC and guesses again. ![]() This tells us if the initial guess is too high or too low. – The output of the DAC is then compared to V_in using a voltage comparator. – First, a controller tells the N-Bit DAC to generate an output voltage. The SAR ADC uses a digital-to-analog converter (DAC) to approximate an analog input signal. – Delta-Sigma ADC (1 available) Successive Approximation (SAR) ADC – Successive Approximation (SAR) ADCs (2 available simultaneously) An analog-to-digital converter accomplishes this task by transforming an analog electronic signal into a digital signal. Rather, these signals must be first converted into a stream of binary bits that a computer can understand. Digital computers like the PSoC 5LP can't interpret analog signals directly. Analog to Digital Converters (ADCs)īefore we can start programming, we'll need some background on analog-to-digital converters. The cheapest option (~$10) is the Cypress PSoC5LP Prototyping Kit, which includes an onboard programmer (negating the need for a programmer cable). Note: If you want to use a battery, use the following wiring when you get to the hookup section of this tutorial: connect the negative end of the battery to ground, and the positive end of the battery to the analog signal wire.įor the microcontroller, you can use any Cypress PSoC 5LP device. If you don't want to buy any sensors, you can even use a battery instead. However, if you don't have this sensor, do not worry! Any analog sensor that operates between 0 and 5V will work (including sensors that operate on the 2.7/3.3V range). This sensor operates over the same voltage range as the board, making it easy to work with. ![]() – The PSoC Creator software (Windows only)įor the sensor, we will be using a Maxbotix ultrasonic range finder, which senses the distance to an object using acoustic pulses. Getting startedįor this tutorial, you'll need the following materials: While this lesson is tailored specifically for the Cypress PSoC hardware and software toolchain, the lessons learned in this tutorial can easily be carried over to other popular platforms, like Arduino. We will cover some of the basics of analog sensing, such as analog-to-digital conversion, as well as the nuts-and-bolts of programming an embedded device. This tutorial will demonstrate how to program an embedded device to read data from an analog sensor. ![]()
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