The board is based on the ATmega328 (datasheet). This version was made in response to a shortage in supply of the through-hole Atmega328P. I was recently informed that those pins are Wire/TWI/I2C pins.The Arduino Uno SMD is a version of the Arduino Uno, but uses an surface mount version of the Atmega328P instead of the through-hole version. On the other hand when I put the pin of the sensor in A4 or A5 there is a change from 1023 (starting value) to 982 and it won't change no matter if I bend the sensor. 362 read not bend and 600 bend, which is fine). For example if I put the flex sensor in analog pin 0 then the values change when I bend it (e.g. The same applies for the values for the sensors. However, it works in another Arduino Uno I have for testing.Īlso I made a test and I found out that pins 4 and 5 in Arduino Uno Wifi produce current for some reason even with an empty script, capable of lighting a LED (while pins 0,1,2,3 do not light it up). The code does not work in the Arduino Uno Wifi: it does not show any change in the bend degrees. Serial.println("Bend: " + String(angle) + " degrees")
Use the calculated resistance to estimate the sensor'sįloat angle = map(flexR, STRAIGHT_RESISTANCE, BEND_RESISTANCE, 0, 90.0) Serial.println("Resistance: " + String(flexR) + " ohms")
Read the ADC, and calculate voltage and resistance from itįloat flexR = R_DIV * (VCC / flexV - 1.0)
Upload the code, then try to adjust these values to moreĬonst float STRAIGHT_RESISTANCE = 37300.0 // resistance when straightĬonst float BEND_RESISTANCE = 90000.0 // resistance at 90 deg Measure the voltage at 5V and the actual resistance of yourĬonst float VCC = 4.98 // Measured voltage of Ardunio 5V lineĬonst float R_DIV = 47500.0 // Measured resistance of 3.3k resistor I am using the code below (copy paste from the official website) const int FLEX_PIN = A4 // Pin connected to voltage divider output I recently got an Arduino Uno Wifi (flashed it with the Wifilink firmware to support UDP) and I have created a simple sketch to read analog values from a flex sensor.
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