Microprocessors are extremely powerful devices. They also shift a great deal of the complexity of circuit design from the circuit board to program code which I find helpful. Below you can find some of my creations. Please go to my PIC and C for Beginners page for more general information and tips and PIC Data Logging page.
|2.4GHz Receivers Ranging from the world's smallest 2.4 receiver for modelling to full diversity designs.|
|QFN soldering Hot plate for soldering surface mount and lead-less components.|
|2.4GHz lockout logger Measures the dreaded '2.4 lockout', assesses receiver aerial diversity and placement, and other difficult reception challenges.|
|2.4GHz scanner Handheld RF scanner / simple specktrum analyser. Developed mainly for RC radios but has useful features for monitoring trends in any use, such as Bluetooth, WIFI, security leaks, antenna/range tests, etc.|
|Free Flight Timer 2g FF timer for Brushless motors. Modification of Bernhard Konze's DIY ESC software and conversion of a commercial ESC to a FF timer. Extensive description of how sensorless brushless speed controllers work.|
|Lithium Tester This device compares individual cell voltages in up to 7 cell packs. Together with actual voltages it has a bar graph to help you see easily if they are in balance. The device also has a data logging mode with which the performance of the individual cells can be assessed under a 4 second load test. The results are displayed graphically to instantly assess performance.|
|Lithium balancer Very accurate and very efficient. Can be built for any balancing current and any number of cells. 3 and 7 cell versions shown.|
|LCD1 Circuit to add a voltage and current LCD display to a power supply.|
|LVC1 Low Voltage Cutoff device which monitors individual cells in a 3 cell lithium pack to prevent any from being over-discharged in flight. When the lowest cell reaches a threshold voltage, the motor is cut until acknowledged by the pilot. LVC2 monitors two separate packs in a twin and cuts both together to avoid assymetrical thrust.|
|Temp2 monitors temperatures in up to four cylinders in a petrol motor to aid cooling and tuning. The data is logged every 20sec and can be downloaded to a PC for analysis. Temp1 also monitors up to four temperature sensors but triggers a single LED if any exceed a programmed threshold. Logs highest temperatures measured by each sensor every 30 seconds.|
|Servo Controller This device allows you to move a servo or control an ESC without a radio. Also often known as a 'servo tester'.|
|Low Voltage Battery Monitor This device monitors a 12v battery to disconnect a load (12v fridge in my case) when the battery becomes flat (via a FET for efficiency). Also demos the 'Charlieplexing' technique of driving more LEDs than there are ports.|
|Many of the above designs perform simple data logging, recording things such as highest throttle position, lowest cell voltage, temperatures, etc. At least 256 data records can be stored over a configurable time period and can be downloaded to a PC.|
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