12/15/2023 0 Comments Convert mamp to amp![]() Secondly, we will output an PWM wave, that varies its duty cycle accordingly to the potentiometer.ĬAUTION: If you are using an ESP board, you will damage it if you connect to 5V. The voltage to read will have a range that goes from 0 to 5 V, since we connected the potentiometer pins to the 5V and GND of the board. Firstly we will read a voltage with the A0 analog input port from the Arduino board. This first step can be divided into two smaller ones. If you never generated a PWM wave with your Arduino board you can check this post, there you will learn how to generate a PWM wave output. The first step of this system is to generate a PWM wave which has its duty cycle controlled by a potentiometer attached to an Arduino board. Generating the PWM using an Arduino board ![]() Follow the next sections to understand in more detail what has been done. This 1-5V output was then converted to 4-20mA using an Operational Amplifier (Op-Amp). This output was limited to the range of 1 to 5V when the potentiometer is in the minimum and maximum scale, respectively. Firstly I wanted to generate a variable voltage with my Arduino board and since the one I used didn’t have any DAC, I used a PWM output and a low pass filter combined to generate a variable voltage using a potentiometer. With this objective in mind and after thinking a bit, I came to the following system in Figure 1. This way, the objective of this post is to generate a current that varies within the range from 4 to 20 mA. To test my algorithms, I decided to develop a test circuit and use it every time I needed one input of that current range. Recently I was working with Programmable Logic Controllers (PLC) and one analogic card that, like it is usual, accepts inputs within the range of 4 to 20 mA. What exactly will be done in this publication? ![]() In the development of this tutorial was used the following equipment:
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |