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I used arduino slave and Nodemcu master codes from the following tutorial. The two are sending test messages. Nodemcu is sending "Hello Arduino" and arduino is sending "Hello Nodemcu". The communication is running perfectly. both are receiving the test properly.
But when I make a string and save...
I am trying to send three numbers like 345, 745, 1 to the nodemcu from arduino but am confused in strings and character array.
Pleas suggest some example or link to the appropriate resource.
This is to be sent to something like ThingSpeak server for IoT
The NoDEmcu is not recognised by windows and Device manager reports it as "USB Single Serial". The chip on board is CP2102 but any driver does not resolve the problem. As the nodemcu is not detected no further progress of uploading the sketch.
NodeMCU not detected.
Arduino IDE is not detecting brand new nodeMCU where as it is detecting previously used NodeMCU on the same system and setup. I bought a new nodeMCU it is also having the same problem. Device manager reports it as "USB Single Serial".
What might be going wrong?
I am trying to make an amplifier to amplify pulses of a microsecond from an optical detector. The amplitude is of the order of 100 mV and a gain of about 50 is desirable.
Any one may please help providing a link to suitable resource and suggest a readily available operational Amplifier IC
Not knowing the dielectric constant of the medium between the two conductors and the effective area it should not be possible to say any thing between the spacing between the two conductors.
Also the value of C = 0.00132 pF does not seem realistic as the stray capacitance contributed in a...
I am using a SD card on TFT screen 1.8" with 180 x 120 pixel.
I could read a file from SD and display it on TFT
I was trying to read the names of the files and store then in array of strings
The renaming scheme will be changed to names like
IR001.BMP
IR002.BMP and so on
the intention is to...
I am trying to store names of 10 files read from SD Card in an array.
The file names are in 8.4 format (like "ABCDEFGH.TXT)
my need is to store them in array of string so that these can be used in a for loop for use and modification (manipulation)
Any suggestion or link to resource will of great...
I am using a USB Oscilloscope with 5 V input (Max).
I have a 10X probe
I wish to make a 100X input divider
This divider with 10 X probe will make it a 1000X arrangement that will allow me to measure 2 - 3 KV pulses in the range of about 100µs.
Any tips or link to appropriate source will help me...
Actually, In addition to the frequency related concern I was trying to find out how do I calculate the capacitance of a capacitor with two layers of the dielectric as shown in the figure with two different dielectric constants.
I am worried about the effect of frequency on dielectric constant and thus capacity of parralel plate CAPACITOR.
C = KA/d
C is capacity, K is dielectric constant of the medium between the two plates, A is area of the parallel plates and d is the spacing between them.
Is this relation...
I am trying to make a current to voltage amplifier.
The current range is 0 - 200 µA in to 1 KΩ.
The expected output is 0 - 5 V.
The question is that is it possible to do this using single power supply op amp LM358
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