Skip navigation
1 2 Previous

DIY Test Equipment

19 posts
sherbieny

Raspberry PI - Ohmmeter

Posted by sherbieny Sep 23, 2017
An Ohmmeter device using Raspberry PI 2B with ADS1015 as ADC   https://github.com/Sherbieny/Ohmmeter-Pi http://fritzing.org/projects/pi-ohmmeter Setup Items needed: PC or Laptop Raspberry Pi (I used model 2B) ADS1015 12bit ADC converter (if you use 1115 which is 16bit, there will be slight changes) Breadbord, wires, resistors Adafruit assembled Pi T-Cobbler Plus - GPIO Breakout (Optional) Circuit setup Refer to fritzing diagrams in schematics folder Configuration SSH, VNC or anyot ...
I started this post as a Wifi Analyzer... but the more I got into it the more it became a complete handheld network analyzer for wireless as well as wired for performing basic network functions such as speed tests and pings, on up to measuring signal strength and identifying noise.   Here are the requirements:   Small form factor (hand held) not much larger than your palm (5 in. screen range), I'm thinking a strap across the back side of your hand 4 hour minimum rechargeable battery ...
Hi i resently got an idea after learning about freenas interface web based I learned that freenas lets you to turn off your computer form the web so i was thinking is it possible to turn the comouter on by the web interface so i tryed to solve this problum. and i was woundering is it possible to have the raspberry turn on my computer by web interface system useing the pins that it had i am well ware of that i could not do this by raspberry ip and a computer i would need a modual to try this out ...
in the office building I work we have DIY addressable led strips surrounding every floor of the building to make it glow at night. It's a part of my job to maintain this setup and unfortunately the setup breaks down a lot.   We we got a defect then I have to open up the sealing and get the 3m long led bar out and take it to the warehouse to test the led strip. I have already bought a wireless soldering iron so I can do small repairs without taking the led strip out of the sealing, but I sti ...
How about building a Raspberry Pi universal multimeter and oscilloscope. You could use the bitscope mod and if you can create a application you can make a multimeter app to measure voltage, resistance and current (Or even a LCR function) ...
This is my submission to the Element14 Project14 DIY   The problem I have recently been doing extensive experimentation with recycled batteries as well as voltage regulators and line control circuits. The customary approach requires a programmable DC load to the connected such that the output can be tested under various conditions. Unfortunately, these commercial solutions are quite expensive in addition to being big and bulky. Due to a constant fear of the spouse with regards to unexplain ...
popupideas

Elevator test unit

Posted by popupideas Aug 27, 2017
one diy test unit I want to build is a g-force accelerometer tested for elevators. Prefer a Bluetooth enabled box you put inside an elevator that when it is sent up it will record the travel speed, acceleration, start and stoppong force. It bit I had issues figuring out was vertical speed. Anyway. I am a loooong way off but maybe one day ...
hlipka

Multi-Ref Mk. II

Posted by hlipka Aug 22, 2017
The Multi-Ref is not a test device as such, but the tool I use to test my test equipment. I got the idea for this from the user [matseng] as the Dangerousprototypes.com forum, and found it very useful. MrRef, as it was called, is just two coin cells powering a precision voltage reference. The intention is to allow checking your own multimeters for accuracy and drift. Not everybody has a 6.5 or better DMM at home, with a accuracy of 0.01% or even better. Back then my best DMM was a TekPower TP40 ...
Introduction Current measurement can be really awkward when working with circuits. Voltage measurements are (usually) straightforward, but when it comes to current measurements the story is different. One typical approach is to insert a known resistance by breaking the circuit, and then measuring the voltage across it. This is difficult if one end of the resistor is not at ground potential, because oscilloscope probes are (usually) designed with the ground leads all connected together, and it wi ...
The Software The Hardware The probe - Try 1 (not that good, please review try 2) The probe - Try 2 Summary Proof of work   The big problem with being a maker newbie, is that you have to have equipment. When I started, I bought soldering kit and a multimerter - things that don't cost allot and are very needful to start your first steps. But I believe the most important test equipment one need is oscilloscope, but it also very expensive. So there is a conflict... ...
Too many button clicks Buttons and tactile switches are frequently used in many projects involving micro controllers; one of the most frequent issue is related to unwanted multiple transitions when the button is pressed once. Tactile switches as well as push buttons are mechanical components subject to the problem of bouncing. When a button is connected to a digital GPIO input pin (i.e. an Arduino pin configured as INPUT) we ideally expect that when the button is pressed we get only one high si ...
Introduction When I saw Jon's The ByEar 2000, I remembered a Cypress' video showing a construction of an analog alarm and posted that as an comment under his blog post. PSoCs usually have many integrated analog and digital peripherals, so I thought I could make a compilation of both mentioned projects. I am an amateur, so don't expect scientific explanations or ground-breaking discoveries I only built this device using a CY8CKIT-050 PSoC® 5LP Development Kit, which is obviously an overkil ...
Peter, Jon and I are designing a programmable electronic load, here on element14: Programmable Electronic Load We'll never make it in time for the DIY Test Equipment initiative (we may have a first prototype In the Year 2525). But it can help you if you want to build a device that can be automated with LABView or similar*.     What's in the current version: - working firmware with a SCPI integration. Complies to SCPI standard out of box. - tested PCB with several ADC and DAC chan ...
I was planning to make a super simple logic probe but Jon beat me to it with his comparator based logic probe. So I've prototyped a microcontroller based one.   Microcontroller based logic probe with display My project has just two modules, an Arduino clone and an Adafruit I2C LED backpack. The probe is connected to an analogue pin although the current software uses it as a digital pin only. The pin is sampled once every half second and 8 samples are shown across the screen on the first 2 l ...
Introduction The Project Planning the Design Testing motors Control I/O DC/DC Regulator Design in practice The Testing Platform The Software Software Design 1. Main Sketch Main loop() structure Motors running status block Serial parsing block Analog reading block Other functions in the main sketch LCD layout 2. MotorControl Class MotorControl - Hardware control methods MotorControl - High level methods 3. Commands Des ...