Digital humidity-temperature meter with analog display

Measuring temperature and humidity is really easy as there are many convenient sensors. Usually to measure humidity along with temperature there are combined sensors used like SHT21. Arduino even have libraries to get things working right away. ff you want to display things there are more options and of course more work to do. Normally digital sensors are reflected in digital displays, but sometimes we like to look things old fashioned. So in this case analog display can be used. Kerry D. Wong built such device with couple analog displays where one indicates temperature and another humidity. Analog displays are custom made where arrows are controlled with couple servo motors. Driving servos with Arduino is also easy so overall code in project takes only few lines of code. It is set to take readings every 0.5 seconds. Temperature scale ranges from 50 to 95 degrees Fahrenheit and humidity from 5% to 95%.   Continue reading

Develop Your Own 40 MHz Frequency Meter Today!

Are you always fascinate with the fancy frequency meter and wish you could build it by your own? Well, instead of wasting your time and dreaming about it, why don’t you take action and build a 40 MHz Frequency meter today? Basically, the project doesn’t require too much of completed tools, as it only a small and cheap frequency meter. Although it’s a simple frequency meter, but it can be used to measure frequencies up to 40 MHz with the high accuracy up to 99%! So, are you impressed with it? Thus, by this degree of precision, it will be more than enough to debug most of your analog and digital circuits. Furthermore, it will also give you the ability to analyze many aspects that you were unable to see or test before too! In able for you to save the cost, you should consider building the 40 MHz frequency meter on a Veroboard. It will only use three components and eight resistors in this project. In addition, it is well designed, so it can be easily plugged into any… Continue reading

Electronic Drum Controller Will be Your Good Music Companion

If you a die hard fan of Drums, I bet you must be excited about this unique and DIY eDrum too. The required components for this project: A PIC16F877 RISC microcontroller Two line (16×2) LCD with backlight Some amplifiers Twenty-two analog inputs Two digital inputs Twenty-two input gain potentiometers Four control buttons One MIDI out One serial RS-232 out You need to remember the main goal for this project is to find and use the cheapest components, but can still be maintain results at the professional standard. By using the PIC microcontroller, the whole design becomes easier to expand and it’s also assembly language friendly as well. Below is the list of eDrum special features: 24 unique velocity sensitive trigger inputs One Hi-Hat stereo input One Snare Dual-Piezo input Six Cymbal inputs with the choke Four Mono Piezo inputs Two modes HiHat pedal operation One MIDI output Four control buttons The RS232 serial port Assorted memory for snapshots Various controllable parameters Since this project is mainly about the Trigger to MIDI conversion matter, therefore the eDrum will not offer any… Continue reading