Day 14: Long-term temperature measurement
Behind today’s door is an NTC sensor (negative temperature coefficient thermistor). Its conductivity changes depending on the temperature. You’ll use the sensor today to undertake a long-term measurement of the temperature. As a small bonus, you can select a time at which you get a summary by email.
For today’s layout, in addition to the NTC, you’ll also need the potentiometer and a 1-kohm resistor. You can make a fine adjustment of the temperature with the potentiometer.
You can load the interface in your Blynk app with the QR code. In the programme you download from the website, besides the current token and your WLAN data, today you have to enter an email address again to which the summary should be sent.
The Blynk interface contains the history graph as the central element. It shows the current temperature as well as maximum and minimum values. In the line below, you can select the time frame of the data to be visualised. You can delete the stored data by swiping on the widget toward the left while the interface is active. You’ll also find the current temperature in the display under the graph. With the elements at the bottom left, you can make adjustments for the automatic sending of a summary. However, with the button on the right side, you can also have a summary sent at any time.