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Li Ion battery Doctor Features: Charge, discharge, amp hours counter, test for short or open circuit, weak battery indicator, measure internal resistance. Charge : TP4056 module (modified), selectable 200 or 500 mA current. TP4056…
7-Segment frame and transparant segments. Size 27 x 47 mm. WS2812B LED display behind the segments needs only one control wire for 28 segments. Arduino : Segment arranged a-g clockwise. Adafruit library. byte…
Weekly pill container. Like a revolver's drum, the lid is securely kept in position by a ball-groove-spring assembly. Spring salvaged from a battery holder. M3x20 bolt. Lid prints with support. Update 28 nov : added 1.25x and 1.5x size.…
Weller TCP Hack Replacing the faulty magnetic switch in a Weller TCP is a costly affair, this project is a workaround for just that. The upgraded soldering iron has a thermocouple sensor and triac heater control. Optionally, the…
3D printed coil and case for the (slightly modified) Clone_Pi_W metal detector. Design from : http://meandr.org/archives/3900 , originally from Andrey F. (fandy.front.ru). Added a potenciometer for volume control, and the 12V battery is…
High voltage curve tracer , isolation tester Some time ago I ordered 230VAC LED modules, consisting of an aluminium coolplate and electronics, separated only by a thin layer of isolation. I wanted to check the safety of the isolation, and…
Description : This instrument has some useful functions for Arduino users. Besides being a voltmeter with data logging, it could answer questions like "how much voltage falls on the LED at 10mA current?" or "is this an IR LED or what?" by…
Buy “SATA to USB 3.0 / 2.0 Cable” from Aliexpress or Ebay.
Servo panel meter for Arduino Servo motor activated pointer on a 12cm scale for use with Arduino. The scale is 3D printed or laser cut wood for rustic look. This example shows the "meter" used with the incredible HLK-LD2420 24GHz radar…
I have more of these CF-19 CF-18 laptops from Panasonic and this cover breaks easily. Quite expensive to buy even as used part. The model I designed follows the display contours well.
Universal casing for bare uninsulated PSU modules from China. Provides safe isolation with good ventilation for all type LED drivers and fixed voltage modules up to 65x40x20mm. This thing was made with Tinkercad. Edit it online…
Arduino 39 keys keyboard with i2c interface for STM32, AVR or any other microcontroller with 3.3 or 5V supply. Size 4x10 cm using 6x6 mm tactile switches. The controller (Arduino Mini 3.3V 8Mhz) is dedicated to this application, and…
Writer / reader for NFC storage system with cards of 144 byte capacity. Remember the days searching for your tiny SMD components with a magnifying glass. This is over. Type in the text you search for, hold the reader near the storage…
Fireplace blower for the winter. Rechargeable 18650 battery, 12V 50x50x20mm fan, boost converter to 12V. What you need : Alu tube 22mm, 32mm, LiIon 18650 battery, TP4056 charger mini size See the black one here…
The project Giant Size LED Nixie Clock, especially making the 28 digits with its nearly 1000 LEDs requires patience and determination. However, the end result is stunning. The LEDs arranged in 1970s nixie look in a glass - old fashioned…
Programmer hardware for Arduino provides galvanic isolation between computer and Arduino device. Prevents ground loop disturbances too. Clean strong Rx Tx DTR signals, tested from 110 to 2,000,000 Baud. Isolated supply built in: 5V or…
Catch the bugs and release them alive (optional). Aim the tube on the target. Push down the cone. The levers close in from four sides catching the bug (max 20mm) unharmed in the chamber. To release, pull up cone. Parts : M3 50 mm bolt ,…
Loupe magnifying glass, LED, with rechargable battery. 3D print : 3 lens diameters 20-22-27mm prefabricated, "do it yourself" STL files are provided too for other diameters. Find a 20-30mm diameter achromatic optical lens. Thick lens…
Big illuminated magnifier on foot, in two sizes. Lens was a condensor lens in a projector. I had it in two sizes, 128mm and 109 mm diameter. The frame holds three 22mm diameter 100 mm long alu tubes which contain one or more 18650…
10W LED lamp uses the Cree XM-L LED. Parts : aluminium reflector 40mm, (plexi-)glass circle 40mm, Cree XML 10W chip on star heatsink, 2 more star heatsinks, 4x4mm 6mm high tactile switch, "Strong light torch driver board" on Aliexpress,…
A cool candle holder, also in the sense that it is only made for decoration but not to burn candles. PLA - or any plastic - will become soft from a burning candle, it will flip and may cause fire. 22mm diameter. For smaller candles, there…
Mousetrap, laser cut plywood, principle based on Markus's thing #2911549. Made of plywood (triplex) and 3D printed feed cone and shutter. Without 3D print, the shutter could be made of plywood too, ( I think plastic parts cause less…
The DSO183 is mechanically distinct from the DSO138. The DS0138 has the same PCB size, can be built in this case too (the front arrangement is different) and requires a MT3608 Module booster power supply to raise the lithium battery…
UFO LED rechargeable lamp 18650 battery Parts : Power LEDs 1W, lens 13mm , 18650 battery (recycled), resistor, torch switch round 8/12mm, TP4056 charger PCB (small version from here…
Clock in matchbox size with touch control Binary clock, it has 16 pieces WS2812B matrix display showing binary coded time. Touching the top, the Arduino gets a wake up interrupt from a TTP223 touch sensor, wakes from sleep, reads the time…
Device measures the amount of liquid in a cylindrical tank. The tank must be of equal cross section in length, and fixed in vertical or horizontal position. Four tank sizes (diameter and height) are selectable by switch. Measurement is…
Arduino adapters for mass production Arduino board prices went up lately, and since I had a lot of Atmega88 chips lying around, it was time to mass produce my simple Arduinos. With the adapters one can load the Arduino ISP and/or user…
Clock shows hours and minutes in "binary" form. From left to right there are 13 digits in four groups, 10 hours, 1 hour, 10 minutes, 1 minute. The digits which are lit, must be added in each group to get the exact time. The 1,2,4,8…
Night lamp with motion sensor. Very simple assembly. Parts : 3D case, RCWL-0518 sensor (new type without protruding LDO chip), strawhat 8mm LED green, N-Mosfet, resistor 56-220ohm, old phone charger. Add a 100nF C-TM SMD capacitor to…
Power supply, multi output (6x USB and more) charger, FSK remote controller code detector Features : Power supply regulated output 1.25-30V with autoranging analog meter display on color TFT. Fast current limiter from 50mA to 1A for…
Touchpad demo, drawing toy Touchpad could be a cheap and versatile input device for Arduino (source : old laptop). Add two switches for mouse-like operation to select-unselect any position on the TFT screen. Parts: Synaptics-like…
Description : See: https://github.com/boda-akos/STM32-Voltmeter-Data-Logger-Calculator This instrument has some useful functions for Arduino users. Besides being a voltmeter with data logging, it could answer questions like "how much…
Cut flanges from module. Jacks and voltmeter wired simply parallel. Glue the 3D halves together when wiring ready. Isolate bottom with a carton sheet.
Sensor using the HCSR04 ultrasonic module. The sensor will turn the light on in a specified area. The light source could be a LED strip (12V) or a 230V normal bulb. The Arduino stores the average of 1000 distance samples. If the measured…
Swaying 10W LED lamp with stroboscopic effect, smartphone control. Servo motor moves power LED, ESP8266 controller. Servo limits, speed, and lamp strobe are adjustable via Wifi. 12V 1A DC power. Prepare the 3D printed parts. Cut aluminium…
Motion sensor LED nightlight with rechargeable phone battery. Simple project, 3D printer and soldering iron is used. Parts : HC-SR501 pir motion sensor, LED green strawhat 8mm, micro USB adapter PCB, Mosfet (any type, must open at 2V gate…
Clock in a bottle Binary clock built in a glass container Pepco / Poundland SKU 34705101. It has 13 pieces WS2812B LEDs for displaying binary coded time. Touching the glass top, the Arduino gets a wake up interrupt from a TTP223 touch…
Small rechargeable lamp with timer using the battery recycled from an electronic cigarette. Challenging project because of the small SMD components. Parts : please see photos. For glue use two component glue AB glue (Aliexpress). How to…
Display with Dual Serial input To follow the communication in a system (Wifi, Lora radio etc.) on both send and receive side in real time, I built this one. It has two independent STM32F103 microcontrollers and two ST7789 TFT-s built…
Small rotating table. Responds to most remote controllers (38kHz carrier). Push any key on the TV remote and the table will rotate for a couple of seconds so you won't forget about your beer, snacks, cookies etc. The base and the table is…
Clock in matchbox size with touch control (The CH32V003 is a new chip, if you prefer the Arduino Mini version, see https://www.thingiverse.com/thing:6302260 ) Binary clock, it has 16 pieces WS2812B arranged in a 4x4 matrix display showing…
LED Filaments for Seven-Segment Displays Seven-segment displays can be made using Chinese-manufactured LED filaments, 38mm in size. These filaments contain multiple LEDs on both sides of the substrate, all connected in parallel. Arranging…
GPS-Disciplined Frequency Meter The purpose of this project is to measure a 32,768 Hz RTC clock frequency against the 1 PPS (pulse per second) signal from a GPS module, with the highest possible accuracy. It can be used to fine-tune…
Quartz accuracy frequency generator 1Hz-22.11Mhz uses the Atmega AVR (88,128,328) PB0 output to generate the MCU clock frequency, and timer output PB1 for divided frequencies. Four tactile switches select frequency ranges from 1Hz to…
The counter is a GPS-disciplined instrument with atomic accuracy, measuring frequency with sub-ppm precision across the 1 Hz to 40 MHz range. The instrument can be used to fine tune quartz oscillators. Upon startup, the ESP32-P4 operates…
Repair a cracked acrylic of your Delonghi Alicia coffee machine with this ring. Material PETG, coffee brown preferred. Clean the cracked acrylic with isopropil alcohol and glue the ring on, using two component epoxy. See picture how to…
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