Sound Activated LED Light With Timer

Clap to light switch with timer project is very useful project for power saving applications. The project switches on the LED light for 45 to 60 seconds when receives two clap sound. This project can be used in store room, toilets, dark area where switch is not visible, night lamp, places where light on off switch is not accessible easily.

Single transistor used as microphone preamplifier, diode converts AC signal in to DC , and PIC micro-controller take care of LED On/OFF Time, LED  time depends on two jumpers J1, J2 which provides four options s 45, 50, 55, 60 seconds. MJE3055 transistor used in output to drive LED, one series resistor R10 helps to control the current going through LED, R10 can be alter as per LED Voltage and current. 3V to 12V LED with maximum current 500mA can be used. Use higher current Darlington transistor like TIP147 for higher current Load. Onboard potentiometer trimmer for sound sensitivity adjust. D1 power LED.

Sound Activated LED Light With Timer – [Link]

HealthyPi v3 – Health HAT for Raspberry Pi

An open-source, multi-parameter, full fledged human body vital sign monitoring HAT for Raspberry Pi as well as standalone use.

HealthyPi is a do-it-yourself, open-source vital sign monitor based on the Raspberry Pi. THe HealthyPi board itself is a HAT add-on for the Raspberry Pi 3 which measures all the human body’s vital signs and sends it over to the Raspberry Pi. Couple it together with the official Raspberry Pi touchscreen and you’ve got a full-fledged vital sign monitor.

HealthyPi v3 – Health HAT for Raspberry Pi – [Link]

4.5 to 42V-in, 4 x 4mm, isolating buck DC-DC delivers 3.7A

by Graham Prophet @ discuss about the MAX17682 buck DC-DC converter.

With details recently posted by Maxim integrated, MAX17682 is a high-voltage, high-efficiency, iso-buck DC-DC converter designed to provide isolated power up to 10W. The device operates over a 4.5V to 42V input voltage range and uses primary-side feedback to regulate the output voltage. It delivers primary peak current up to 3.7A and regulates primary output voltage to within ±1.2% over -40°C to +125°C.

AS7261 Color sensor from Ams

The AS7261 integrates Gaussian interference filter technology to enable chromatic white color sensor which provides direct XYZ color coordinates consistent with the CIE 1931 2° Standard Observer color coordinates. Additional mapping of XYZ coordinates to the x, y (Y) of the 2-dimensional color gamut and scales of the CIE 1976 u’v’ coordinate system, providing accurate Correlated Color Temperature (CCT) measurements and color point deviation from the black body curve for white light color in the ∆u’v’ coordinate system. A Near-IR channel and LED drivers with programmable currents increase application flexibility, including support for electronic shutter applications.

AS7261 Color sensor from Ams – [Link]

Nixie Bargraph Kit

Robin @ launched his new campaign on a project using IN-9 Nixie tubes. Now you can easily control two IN-9 Nixie bargraph tubes with 2 PWM inputs from your Arduino, Raspberry or other control board. The tubes are controlled by PWM signals and adjusting the PWM duty cycle you can control the tubes height, thay easy!

I had the idea for this project after building myself a Nixie bargraph clock which looked fantastic and eye catching. Instead of using conventional nixie tubes, which use numbers to display the time, the time is indicated by the height of the neon glow. But, this isn’t just limited to displaying the time, anything can be indicated with these tubes, temperature, humidity, atmospheric pressure, proximity… anything!

Electrolytic + polymer = the hybrid capacitor

Electrolytic capacitor is often a common reason for device failure and replacement is necessary. But what if we could combine the benefits of electrolytics and polymer capacitors. Now you can have the best of both worlds: hybrid capacitors from have been designed to combine the advantages of electrolytic capacitors with those of solid polymer capacitors.

The supplier claims the use of hybrid technology offers low leakage current and long life in combination with low ESR (20 mΩ) in miniature case sizes. The EEH-ZE series (Type V-ZE) hybrid components offer a nominal capacitance range of 33 µF up to 330 µF, at voltage ranges from 25 VDC up to 63 VDC, and feature an operating temperature range of -55°C up to 145°C, as well low ESR and high ripple current. So think about using a hybrid capacitor in your next power converter input/output filter, voltage regulator, or clock circuit.

Electrolytic + polymer = the hybrid capacitor – [Link]

USB 3.0 NanoHub

Muxtronics @ designed a USB 3.0 mini hub. Source files here:

Are you familiar with my NanoHubs? Tiny, penny-sized USB hubs you can use to add additional USB ports in incredibly cramped spaces, like hacking projects or mobile devices? Whereas the original NanoHubs were all USB 2.0, limited to 480Mbps, this new NanoHub allows for transfer speeds of up to 5.0Gbps, as well as up to 3.0A of power delivery. The cut-off connector boards allow you to test your application before soldering it into your product, reducing the size of the hub from 27x34mm (about 1.1×1.3″) to 20x20mm (4/5ths of an inch on each side), with an overall thickness of just 1.55mm (1/16″).

USB 3.0 NanoHub – [Link]


ESP32 Monster board, Ether, CAN, OLED all in one

ESP32 monster board with Ether(LAN8720A), CAN bus(SN65HVD232DR), OLED(SH1106), Lipo-charger and FTDI interface @

ESP32 Monster board, Ether, CAN, OLED all in one – [Link]

Opensource USB HUB

Christian @ build his own USB Hub based on GL850G IC:

I was looking to make a custom USB Hub for a project but I couldnt find any of them that worked and using the chip GL850G. The chip is pretty old and cheap, but in my case I didnt need to use any of the fast transfering USB3, probably the next version can be based on this schematic.

Opensource USB HUB – [Link]

Pool Buddy – Monitor your pool water quality

Monitor and log water quality (pH & ORP) and temperature from everywhere.

Instead of performing regular checks with tester kits to maintain adequate pH and chloride levels in our (small) swimming pool, I decided to build a project that monitors the water continuously and registers the data online so I can easily inspect it.

Pool Buddy – Monitor your pool water quality – [Link]