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Woof Meter
Margolin Nov 08,2021
The Woof Meter is for testing subwoofer speakers to measure their Thiele-Small (TS) parameters. These parameters are necessary in order to properly design the speaker cabinet. Sometimes you might not have the TS parameters for a subwoofer speaker you want to use and sometimes the TS parameters provided by the speaker manufacturer are wrong.  To measure the TS parameters of a subwoofer you need a sensitive voltmeter with a good low frequency response. Your voltmeter might not have a low-freq...
4th PCB Design Contest-IoT Theme
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Precision Low Frequency Signal Generator
Margolin Nov 08,2021
The Precision Low Frequency Signal Generator produces a User-selected signal from 10Hz to 90Hz with 0.1Hz resolution for testing subwoofer speakers. The frequency is displayed on a 16x2 LCD. The sine wave is produced by stepping through a table of 64 values and sending them to the MCP4921, a 12-bit serial DAC that uses an SPI interface. This is how to use the Precision Low Frequency Signal Generator. INC- Press and release to increase the frequency- Press and hold for about 2 seco...
4th PCB Design Contest-IoT Theme
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Soil Moisture Sensor ESP32 PCB
_adikar Nov 08,2021
Project BackgroundI am very fascinated by technology since my childhood. I like working with electronic gadgets and I am very keen in developing things on my own. Hence, I decided to design a circuit based on the ESP32 IoT development module.Circuit DesignThis circuit consists of a ESP32 development board, a soil moisture sensor and an OLED display. The ESP32 module powers up both the Sensor and the display.The soil moisture sensor has 2 probes attached to it. These probes go into the soil. Thes...
4th PCB Design Contest-IoT Theme
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Firefighting Bot Controller
Deblina Chattopadhyay Nov 04,2021
What it doesA firefighter robot control unit, that can actively sense the presence of fire and tries its best to put it off autonomously. It can sense fire no matter how the robot is oriented in a place. IoT connectivity to get you notified, if any mishap occurs, no matter where you are(of course not inside deep caves, or the middle of the ocean. How it worksThe power supply receives an unregulated dc power supply from the outside, preferably a battery, and creates voltage levels with ...
4th PCB Design Contest-IoT Theme hardware automotive
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400 Watts True RMS Stereo Amplifier Board with inbuilt DC Rectified supply.
Sharma Nov 03,2021
Its 400W Stereo Amplifier Board. Works on 45-0-45 12A Transformer, Designed in Single Layer to Get easy Prototyping,
4th PCB Design Contest-IoT Theme
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BLE I/O board
Enel Nov 01,2021
This is a board with BLE device and support for UART and I2C external devices. This allows you to program several scenes depending of external information and share the data colected by this board with other devices.It has 4 analog input, 4 digital outputs and 2 PWM outputs. There are two general purpose LED and it can be powered with 5V over the microUSB connector.The main purpose of this PCB is to use an smartphone App to program this board. So you can send data over bluetooth and forget about...
4th PCB Design Contest-IoT Theme
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Relay Module With Onboard Feedback System
ArdaBildik Nov 01,2021
I made this relay board because sometimes controlling a light isn't enough you need to learn the output state of the relay. Like a wifi light relay with both digital and physical control, if someone opened the light the system is still believes light is close.To make programming the feedback system I used an LED and a LDR. To make a sensor with LED and LDR I used a heat shrink to hold them together and get rid of the light coming from other light sources.Assembly Tip:Solder SMD parts before the ...
4th PCB Design Contest-IoT Theme
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W498652AS1C5_esp12swithch board-Edge_Cuts
Mohammedaslamnk Oct 30,2021
Ii is pcb based on esp8266 running on tasmota. it uses esp12 and through-hole components.it uses a generic 5v power supply.It is first prototype make please make sure there is no error
4th PCB Design Contest-IoT Theme
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Dumbbell rep-counter and timer
Turner Oct 29,2021
In the wake of the Covid-19 virus outbreak, many people have found it difficult to keep fit or find the motivation to exercise at home. Consequently, I have designed my product to help the average person keep fit at home.Overview of design:Starting at the battery module, it should be powered by a single cell 3.7v battery at your choice of capacity bearing in mind the circuit runs at 500ma. There is an AAP2154OIR1 charge controller and a micro-USB port for charging and a TPS77633DR linear-voltage...
4th PCB Design Contest-IoT Theme Exercise AVR
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MCP1700 Mini Breakout Board
fuoco66 Oct 27,2021
This is a very simple breakoutboard for the MCP1700 Voltage regulator.This is an awsome component, best suited for battery powered application, due to it's low drop out voltage, and it's low quiescient current.So it's perfect for IoT projects.Unfortunately is not breadbord friendly, so it's nearly impossible to prototype with it, or to use it as a drop in component.Also there aren't any breakout available, that's why i designed it myself.The schematic is pretty simple, but with this board it's m...
4th PCB Design Contest-IoT Theme Voltage Regulator Battery powered
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