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Some notes
Instructions from Hydroponics Sensor
The ESP-32 board pins operate in 3.3v levels while the Gravity pH and EC sensors operate in 5V. I inserted a simple voltage divider to shift 5v to 3.3v levels on the signal pins.

Arduino or Wemos Code
Instructions from WiFi Signal Strength Scanner Monitor or Checker
In the arduino code set your WiFi credentials char wifissid[] = "ENTER YOUR WiFi SSID HERE"; char wifipass[] = "ENTER YOUR WiFi PASSWORD HERE"; Normally, the signal strength is displayed in dBm. But for a non techie person, the signal strength in terms...

Trying out GATTTOOL
Instructions from Reading a bunch of BLE sensors with raspberryZero
Now that i know how to access and decode the data lets try the Raspi GATTTOOL default BLE handler:Native to Debian and a lso to a bunch of linux distros or so i've heard of . First i reset the bluetooth of the raspi, just in case: sudo service bluetooth...

Aeroponic All-year Greenhouse on a Budged
Instructions from Aeroponic All-year Greenhouse on a Budged
Next we will prepare the water flow. I decided to use this combination of pump and tubing, because they fit without an adapter. Other combinations work also. Clear tubbing isnt the best solution, because algae will grow inside the tubes. you can prevent...

Ultraviolet Lightsaber. Kill COVID-19 with Style.
Instructions from Ultraviolet Lightsaber. Kill COVID-19 with Style.
UV-C bulbs use a dab of mercury plus a glowing hot filliment in a low pressure tube of glass to generate ultraviolet light that peaks around 253.7 nano meters, the optimal germicidal wavelength in the UV-C part of the spectrum. Not to be...

Manual SMT Pick and Place Machine
Instructions from Manual SMT Pick and Place Machine
The Arduino code is incredibly simple, with some strange looking oversampling for preventing the motors from vibrating:void sampling() //Oversample the slider readings to avoid motor vibration. { i=0; val =0; smallVal=0; while(i

Rails
Instructions from Rave in a briefcase
I went for 2x3U. I screwed a piece of roofing battens into the case and the bottom rail directly onto them. The middle rails are just screwed together and are laid onto some standoff I laser cutted out of some scrap wood. The top rail...

Sugarcube - a tactile music controller
Instructions from Sugarcube - a tactile music controller
I attached a 2 axis gyroscope and 3 axis accelerometer onto this project so that I could add some interesting control to the device. The 5 degrees of freedom board from Sparkfun outputs data from its gyroscope and accelerometer as analog voltages. I...

Instructions
Instructions from DIY Ntrip Server and Reference Station Setup
DIY Onocoy Reference Station Setup GuideIn this guide, we’ll walk you through the process of setting up your own GPS Onocoy server using cost-effective hardware options and reliable GPS receivers. Whether you’re interested in enhancing the accuracy of...

Cheap-dirty-perfect V-Groove Foam Cutter / Bender
Instructions from Cheap-dirty-perfect V-Groove Foam Cutter / Bender
To bend the foam...Add some adhesive tape on the backside of the foam and you can safely bend it.I learnt this trick from Ed at Experimental Airlines and used the tool to build his Photon glider.

Powersupply / MIDI / Audio Out
Instructions from Rave in a briefcase
Next thing was the PSU. Since I had a spare NiftyCase laying around, and they have a PSU / MIDI In and Audio Out already in the case, I decided to just canibalize this. The NiftyCase electronics consists of two PCBs, connected with a ribon cable. I laser...

rDUINOScope Boiana
Instructions from rDUINOScope Boiana
TEP 3 AssembleFor more detailed instructions, please visit the Project Website : http://rduinoscope.co.nf/rDUINO_step3.htmlNow is the time to create the Shield board. A Shield board is a board with pinouts which you stack on top of the ArduinoDUE board.Some...

Code for single Esp32 Board
Instructions from Bluetooth Tracker
This is the code for everything on a single Esp32 Board. Since I didn't have the correct board, I needed to use two of them, and they communicate through the serial port.The Bluetooth packets address and raw data get printed to the Arduino Serial...

STEP 6: AD-HOC and sensor network
Instructions from The crime catcher
This will play a vital role in maintaining connections between several sensors involved in OBC (on board chip) and some research have to be done on deciding protocol to maintain communication between police station and drone.

NODE-RED CONNECTIONS!
Instructions from OBS_IRL_STREAM_DECK
The first thing we need is a basic flow to separate button presses into different outputs. [{"id":"50b49ab2.1e6f64","type":"mqtt in","z":"7805686.aa4fd98","name":"","topic":"button_glove","qos":"0","datatype":"auto","broker":"","x":310,"y":2180,"wires":[["ea9f502f.2dd17"]]},{"id":"ea9f502f.2dd17","type":"json","z":"7805686.aa4fd98","name":"","property":"payload","action":"obj","pretty":false,"x":490,"y":2180,"wires":[["425aef92.aa3da8"]]},{"id":"425aef92.aa3da8","type":"function","z":"7805686.aa4fd98","name":"ButtonSeperator","func":"var...