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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Is my water monitoring draft okay, and do you have suggestions?
hello everyone i am trying to create a water monitoring and here is my draft is it okay or do you guys have suggestions? the ammonia sensor is temporary because I cant find a water based sensor for ammonia right now. I am new on iot btw
How does R41 affect AC measurement accuracy in my energy meter?
Hello everyone, Good day. While working on my energy meter project, i noticed that the accuarcy of measurement ( AC and AC voltage) increases or decreases with a change in the feedback resistor R41 as seen in the images above. The image above is for AC reading, i used the ZMCT103 current transformer with a turns ratio of 1000:1, I observed the following:
1) While using frame 2 and R41 as 5.1k ohms, getting an accurate current reading for loads as small as 60 watts was difficult. For a 60-watt load, the current at 220v will be 0.2727A, flowing through the primary, and with a turns ratio of 1000:1, the current at the secondary will be 0.2727mA. With the burden resistor R35 set to 150 ohms, the voltage across will be 40.9mV. The gain of the amplifier will be gain = Rf(R41)/ Rin(R37) in this case will be 5.1/22 = 0.2318. Now Vin = Vout/ gain, which makes Vout = Vin * gain = 40.9mV * 0.2318 = 9.48mV. R40 which is 22k gives the voltage an offset of 3.3v, which now makes Vout = 3.3v + 9.48mV = 3.30948v at the output of the op-amp which is further divided by 2 since there is a voltage divider at the output which now gives my voltage going to my adc to be 1.65v....
Urgent Review Needed for IoT Board Design with GPRS, WiFi, and Bluetooth Features
Hello everyone, I have a design I need to send to production tonight, the design just came in some hours ago.. It's an IOT board. In the firmware, I will use GPRS, WIFI, and Bluetooth. Please I just need a quick review, i would appreciate any pointers and adjustments. I am not through with the routing and placements yet.
Has Anyone Seen a Knob Design with a Wide Top and Narrow Bottom for Micro Synths?
Came up with a new 6mm knob design for a micro Synth I've been trying out. This works well for what I wanted (a bit more grip, and clearance from the other knobs below) but I keep thinking that something similar must exist already. I've looked around a bit, but has anyone seen a design like this, where the big part of the knob is on the top and the skinny part is on the bottom?
If not that's fine, but maybe I'm reinventing the wheel?...
Can I Use a Single Pin as Both Rx and Tx on an ATtiny85 for Software Serial?
Related question: I'll likely use an ATtiny85 for this project, meaning limited IO pins (WIP schematic pictured). I'll mostly be listening for signals with a software serial Rx pin, but would be nice to be able to use Tx periodically.
Is is possible to refine a single pin to use it as both Rx and Tx (though not at the same time)? Per some previous Arduino code - https://github.com/JeremySCook/arduino-experiments/blob/main/MIDI/1-inch-MIDI/2-inch-midi.ino - I was able to set the Rx as the reset pin, which doesn't really function the way I set things up, so maybe it's possible. OTOH, SoftwareSerial is defined there outside of the setup function there, so I'm not sure if you can change this dynamically....
How to Reverse the Output of a Reed Switch Circuit to HIGH?
I'm using a circuit that gives a LOW output on D when a magnet passes by the reed switch. Is there a way to make it output HIGH instead? (HIGH being 3.3V, which is the voltage I'm powering the circuit with).
