Editing Tutorial Analog IN
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* you understand how to build a voltage divider to read a sensor value from a changing resistor | * you understand how to build a voltage divider to read a sensor value from a changing resistor | ||
* you can connect a Potentiometer, a slider, and a [[LDR]] to the ESP32/ESP8266 and read the value | * you can connect a Potentiometer, a slider, and a [[LDR]] to the ESP32/ESP8266 and read the value | ||
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= Instructional Videos = | = Instructional Videos = | ||
The videos are a first test... the ones marked with ** will be replaced over the next months with new versions. | The videos are a first test... the ones marked with ** will be replaced over the next months with new versions. | ||
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In this video on youtube (46:23) we show how to connect to read in an analog value with MicroPython. We also show how a sensor that is based on a changing resistance can be connected using a voltage divider: https://youtu.be/gjj5KyK2qGI | In this video on youtube (46:23) we show how to connect to read in an analog value with MicroPython. We also show how a sensor that is based on a changing resistance can be connected using a voltage divider: https://youtu.be/gjj5KyK2qGI | ||
| − | <youtube>gjj5KyK2qGI</youtube> | + | <youtube>gjj5KyK2qGI </youtube> |
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= Schematics and Code Example = | = Schematics and Code Example = | ||
| − | == Schematics | + | == Schematics == |
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This should divide the voltage by half as both resistors are the same - you should read a value of about 2000 (assuming 12Bit resolution with a range of 0-4096) | This should divide the voltage by half as both resistors are the same - you should read a value of about 2000 (assuming 12Bit resolution with a range of 0-4096) | ||
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[[File:R2.JPG|300px]] | [[File:R2.JPG|300px]] | ||
Connecting the potentiometer (poti) or slider. The value you read is dependent on where your poti or slider stands. | Connecting the potentiometer (poti) or slider. The value you read is dependent on where your poti or slider stands. | ||
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[[File:Rpoti.JPG|300px]] | [[File:Rpoti.JPG|300px]] | ||
Connecting the light dependent resistor (LDR). The value you read is dependent on how bright it is. | Connecting the light dependent resistor (LDR). The value you read is dependent on how bright it is. | ||
| + | [[File:Rldr.JPG|300px]] | ||
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| − | == Code Example | + | == Code Example == |
This makes Pin 34 an analog input and set it to 12 bit. It reads the analog value every second and print it to the console- | This makes Pin 34 an analog input and set it to 12 bit. It reads the analog value every second and print it to the console- | ||
<syntaxhighlight lang="python" line='line'> | <syntaxhighlight lang="python" line='line'> | ||
| − | #Example usage | + | #Example usage |
from machine import Pin, ADC | from machine import Pin, ADC | ||
from time import sleep | from time import sleep | ||
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analogPin = ADC(Pin(34)) | analogPin = ADC(Pin(34)) | ||
analogPin.atten(ADC.ATTN_11DB) | analogPin.atten(ADC.ATTN_11DB) | ||
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while True: | while True: | ||
