UV APOGEE DETECTOR v3 – 3.7V LiPo SUPPLY

This gallery contains 6 photos.

This is a slightly modified version of the UV APOGEE DETECTOR v2 and the purpose was to make a very small UV apogee sensor that will work with 3.7v LiPo batteries and will fit even in a tiny rocket. The components were chosen so that the circuit works at low voltages – as low as […]

DIY SPOT WELDER

This gallery contains 31 photos.

On few occasions when I was making some equipment for oxidizer synthesis I needed to make spot welds but didn’t have the welding apparatus for that. So I decided to make for myself. After some research in internet on this topic I finally made a spot welder from an old microwave oven transformer. SCHEMATIC AND […]

REMOTE CONTROLLED ROCKET LAUNCH FIRING SYSTEM

This gallery contains 11 photos.

REMOTE CONTROLLED ROCKET LAUNCH FIRING SYSTEM There are numerous out of the shelf solutions for remote rocket firing however I found that they are either too expensive or lack some futures that I prefer they had, so I decided to make my own. This device is based on the Microchip’s MRF49XA chip and works in […]

LASER TRIGGER FOR CHRONOGRAPH

This gallery contains 12 photos.

I finished this laser wall trigger for my HIGH RESOLUTION AND ACCURACY CHRONOGRAPH. The purpose of this device is to generate the trigger start and stop impulses for my chronograph as soon as an object disrupts any of the laser beams. So if I have two laser walls (with one or more laser beams on […]

BAROMETRIC APOGEE SENSOR FOR AMATEUR ROCKETS

This gallery contains 8 photos.

This barometric apogee sensor was built as more reliable rocket apogee sensor than the UV sensor while still keeping the things as simple as possible …  nevertheless this barometric apogee sensor is quite universal and could find different applications in the amateur rocketry.  The specifications are: – barometric apogee detection – high noise immunity through […]

MINI PIC GPS DATA LOGGER WITH MICRO-SD CARD

This gallery contains 7 photos.

Based on my first GPS data logger  I made a new version which is even smaller than the initial design and should be able to fit in any rocket, RC model etc. The new GPS data logger uses micro-SD card and 3.7v LIPO battery as power source. The board was also optimized and the new […]

GPS TO GSM TRACKER WITH 2 POWER OUTPUTS AND REMOTE CONTROL THROUGH SMS

This gallery contains 16 photos.

This GPS to GSM tracking device is a new project that I recently finished. This tracking device was specifically developed for tracking amateur rockets or high altitude balloons. Basically the tracker sends the current coordinates and status by SMS and in the same time it is capable of receiving and executing commands through SMS. The […]

SMALL PIC GPS DATA LOGGER WITH SD CARD

This gallery contains 8 photos.

Few months ago I was asked if the ADC DATA LOGGER can be used as a GPS data logger – it can’t. Being intrigued by the question I decided it won’t be a bad idea to design such relatively simple GPS data logger that can be placed to track a rocket, a RC plane, car […]

PWM POWER REGULATOR

This gallery contains 5 photos.

In order to synthesize chlorates and perchlorates in the home lab it is always good to have a way to regulate the current flowing through the electrolyte. Because the load is purely resistive the simplest solution is a small PWM (Pulse Width Modulation) regulator. So I decided to make my own. The schematic is very […]

TINY LOAD CELL AMPLIFIER

This gallery contains 10 photos.

I wanted to test some cheap load cells but I didn’t have a dedicated instrumentation amplifier (IA) therefore I made a small PCB for the occasion. The schematic is very simple and allows me to use the PCB with two different single supply IA – INA122 or AD8422. The power supply is a simple AMS1117-5V […]

HIGH RESOLUTION AND ACCURACY CHRONOGRAPH

This gallery contains 13 photos.

This is a project is for chronograph that was purposely build for a good friend of mine to be used for accurate measuring of high speed processes. The main characteristics of this chronograph are: two separate timers minimum measuring time of 850 nano-seconds maximum measuring time 10 seconds resolution of 100 nano-seconds 80 nano-seconds timing […]

ROCKET THRUST STAND SMALL DAQ SYSTEM

This gallery contains 20 photos.

After I made my main DAQ system (ROCKET THRUST STAND DAQ SYSTEM WITH GLCD) I decided to make something smaller, less sophisticated and more energy efficient.  So after some thinking about what functionality should I have and how much energy efficient the system should be I came with the following device: DAQ system Description:   […]

SMALL FLIGHT COMPUTER (BREO N)

This gallery contains 11 photos.

This small flight computer is the same computer as my MINI FLIGHT COMPUTER (BREO M) but it has two more powerful MOSFET transistors instead of the small ones I used on BREO M and the mounting holes are 4 at the corners instead of 2 in the middle which makes it much easier to solder […]

FLIGHT COMPUTER WITH UV APOGEE AND TEMPERATURE SENSORS (BREO UV)

This gallery contains 16 photos.

This is another old project that I just finished – a flight computer with programmable outputs. This flight computer is based on my small digital barometric altimeter, the small accelerometer and the UV apogee sensor. This flight computer has excellent functionality with 4 high current outputs and the possibility for installation on the outer surface […]

MINI FLIGHT COMPUTER (BREO M)

This gallery contains 10 photos.

After I some time I found free moments to finish an old project – a flight computer with programmable outputs. This flight computer is based on my small digital barometric altimeter and the small accelerometer. Despite the modest dimensions of the device – only 60x15x15 millimeters – it has excellent functionality.  The main characteristics are: […]

JETEX/RAPIER ROCKET MOTOR THRUST STAND

This gallery contains 32 photos.

This is a joint project between me and –vega- (Yordan) for making a very small thrust stand that will be used for testing Jetex and Rapier like motors. Those motors typically have burn time between 12 to 20 seconds while producing thrust in the grams range. DAQ System: The electronic part of the project is […]

VARIABLE POWER FM RADIO TRACKING

This gallery contains 14 photos.

One thing is for sure – rockets always come back to the ground, however sometimes we are not sure where they landed.  Currently there are many tracking devices on the market, but they are either too expensive, too bulky  or require special radio equipment which is often not available to everyone. So  started this project […]

MINI DIGITAL BAROMETRIC ALTIMETER

This gallery contains 20 photos.

I found on Ebay very nice, small 12v 23A battery holders for PCB mounting style and decided to fit the SMALL DIGITAL BAROMETRIC ALTIMETER just on the back of the holder. So basically this is the same schematic as the SMALL DIGITAL BAROMETRIC ALTIMETER, however I moved some of the connections to different MCU pins […]

ROCKET THRUST STAND DAQ SYSTEM WITH GLCD

This gallery contains 41 photos.

I’ve had a very basic DAQ for thrust metering that needs to be connected to a PC. So I decided to make something more sophisticated and robust and most important standalone DAQ system for thrust metering… When I designed the DAQ system I wanted it to have the following characteristics: – 8 test capacity with […]

SMALL DIGITAL ACCELEROMETER

This gallery contains 24 photos.

  I had few MEMS accelerometers around and thought it would be nice idea to be able to measure the acceleration during the rocket flight. Why is it good to know the acceleration – well it is fun to brag about how many g’s you rocket experienced :). Of course I had more scientific intentions: […]

SMALL DIGITAL BAROMETRIC ALTIMETER

This gallery contains 17 photos.

  Once the “larger” altimeter with LED display was done I decided that it would be great if I had even smaller and lighter altimeter that I can use in small model rockets. So I designed this small altimeter which is entirely based on the one with LED display however it is missing the display. […]

DIGITAL BAROMETRIC ALTIMETER WITH LED DISPLAY

This gallery contains 39 photos.

This is an old project which I have been deferring for a while because I lacked time to finish it. Also I was missing a reliable way to verify the altitude calculation algorithms. Now I finally found some time and a way to test it… Before I start describing this altimeter here’s some basic physics […]

UV APOGEE DETECTOR v2

This gallery contains 14 photos.

Although the UV Apogee Detector 1 is completely functional after number of tests done in Bulgaria by -VMK- and vega and in Argentina by a_centaurus some things worth improving came to the light: 1.    vega mentioned that the indicating LEDs  (red and green) are not bright enough in a sunny day and instinctively one might […]

UV APOGEE DETECTOR v1

This gallery contains 23 photos.

Basics: There are two main principles that this device is based on – the Earth’s albedo (reflection coefficient) and the fact that LEDs can generate current from light. The further described device works by measuring the Earth’s albedo. This reflection coefficient is being determined as the ratio between   the energy reflected from the Earth’s surface […]