DevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
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DevHeads IoT Integration Server
The DevHeads IoT Integration Server accelerates technology engineering by helping pro devs learn, share and collaborate.
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How can I correctly measure battery voltage using the A0 pin on Arduino?
I want to know when the batteries of a model are getting low.
The 5 AA batteries are over 5 volts so I cannot check the end voltage.
I make a tap after the second AA battery and take it to pin A0.
Unfortunately a meter shows a voltage of 2.39 but A0 shows 1.18!!
...
Has anyone ever got the CH224K to work correctly?
Has anyone ever got the CH224K to work correctly? For some reason it doesn't seem to be able to request voltages above 9V. Only 5V and 9V are possible.
ESP8266 Relay Stays On – Why Won’t It Turn Off?
Hi, I bought a kit on Amazon that I'm trying to control with an ESP8266. I’ve successfully uploaded the code to the ESP8266 and can monitor the readings from a capacitive moisture sensor through the serial port. I’ve also calibrated the software to trigger a relay that turns ON with LOW level to control a pump.
While the serial monitor and relay indicator lights show the pump is turning on and off as expected, the relay itself stays on. The only way to turn it off is by disconnecting the 'In' pin or the VCC. I'm powering the relay through the 'Vin' pin, which measures 4.6V. I’ve also tried using the 3.3V pin from the ESP8266, but the issue remains the same."...
Seeking Feedback and Improvements for My New Design – Suggestions Welcome!
Hi all,this is my new design,Im open to any insights of making better designs than this.If you can locate some issue,please help
What is the Optimal Electrode Shape for Non-Contact Water Level Sensors in a Coffee Machine?
I am trying to design an automatic water filling system for my coffee machine. I need to design and make two non-contact non-immersion level sensors for the water tank. Ideally these should use electrodes on a thin printed circuit mounted just behind the tank. It needs to detect two levels:
A low level "turn the water on" sensor
A high level "turn the water off" sensor
What is the best shape to make these electrodes?
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PCB Design review. How did I do?
Very new to designing a PCB and want to see how well I've done. This is a Mini PCI-e card that is a mixture of the CANable USB module but in a PCI-e form for the development board I'm working with, but I've also added connections for a Beitian be-880 GPS module.
Troubleshooting Frequency Dropout Issues in Instrument with Photodetector
Hello, I am working with a instrument where we frequently get the problem of frequency drop out, i.e. suddenly frequency signal goes missing i.e. goes to zero, this cause the loss in data as shown in the below image. Yellow is received frequency signal from Photodetector and Purple is the demodulated data (our desire output). When frequency goes zero the purple line is constant so data is lost.
Can you help me find a solution for this problem!...
Connecting 12V WS2815 LEDs to Arduino Nano: Do I Need Any Precautions to Ensure Safe Operation?
Hi everyone, I am building a light cube using WS2815 individually addressable LEDs, which are powered at 12V. There are almost 700 LEDs in total but only max 50 will light up simultaneously. Using an Arduino Nano to drive the strips, with wiring diagram as shown here.
As shown in the diagram, I am using a power supply that gives both 5V and 12V. I am connecting the GND of the B channels on the LED strips to GND. I think I should also connect the GND from the 5V and 12V power supplies to make sure they have the same reference voltage.
My question: do I need to add any precautions anywhere to avoid my Arduino from getting fried or the LED strips from working as intended ?...
Solution:
I suggest based on the diagram that you can add a current limiting resistor to reduce the amount of current going to the nano chip so it won't be very much.
Then try to calculate the total power that is required to turn on all the led. It seems the total current needed is insufficient to power the 70 led. I suggest you increase the current of the D-60A power supply little bit further....
How to Interface a 4-Wire Vacuum Suction Motor from a Vacuum Robot with a Raspberry Pi?
This is a vacuum suction motor from vacuum robot that am trying to interface with Raspberry Pi. It has 4 wires and am not able to get it working. Any suggestions on wiring
Check Out My New Mini MIDI Controller Prototype – Any Tips on Design or Control Ideas?
My latest WIP, the "World's Second Smallest MIDI Controller" (I think). It's a bit bigger than the first iteration https://www.youtube.com/watch?v=5Ws_JfCw5NY in order to accommodate a potentiometer and larger buttons, as well as a CR2032 battery instead of a CR2016. I also added an ICSP header pinout with the extra room, which is an absolute treat to flash versus using a chip clip, at least in my initial LED flashing test. Also used some better solder paste and possibly heated it to a better temperature and things seemed to melt into place MUCH better.
Cool making a 2nd prototype of something and getting to correct some of your errors! If any of you are musically inclined (or even if you're not) any suggestions on how to actually use it controls-wise? I have some ideas, but good to get other perspectives!...
