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2017
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 ...