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Dirty cheap frequency counter

Scott has finished his $10 frequency counter which is able to count from practically zero up to as high as RF signals. Project uses a nAtmega16 microcontroller which counts signals coming from dual 16-bit (32 total) 74LV8154 counters. Counter scales signal frequency down that allows to reach high frequencies of measured signal. Frequency is displayed on multiplexed six digit 7 segment LED display. It simply to use – turn on power, plug signal source and you should see frequency value right away. Continue reading

Atmega128 multipurpose meter

Atmega128 is quite powerful microcontroller giving enough I/Os, memory and interfaces. Don Carveth some time ago constructed a megameter – a multipurpose device based on this microcontroller. Together with PC interface megameter has a nice bunch of features including: Two 0 – 10 VDC voltmeters; One 0 – 30 VDC Hi-Z autoranging voltmeter with x10 jumper to give 0 -300 VDC range; 0 – 3 Amps high side ammeter; 4 channel logic analyzer; Frequency generator – 50% duty cycle square wave, 0 – 5 VDC, uC clock with divider, 1 Hz to about 8 MHz; Waveform generator – sine, triangle, square wave, 1Hz to 20+ MHz; Frequency counter; +5 VDC supply – 200 mA available; -5 VDC supply – 300 mA available Board communicates via RS232 interface. If you will decide to replicate it – it should be easy to upgrade to USB with simple USB-TTL converter. [via] Continue reading

Cheap Yet Useful AVR Frequency Counter

What can you do with the $50 in present days? Well, some of you might want to feast yourself with some fast foods; Or, you might want to buy a new clothe etc. What is your reaction, if you are being told that you can have a 40MHz frequency counter for under $50? Yep, this is not a joke, where with less than $50, you can have an 8 digit LCD display, 10Hz resolution, a six channel digital voltmeter, and the optional offsets (The offsets are being used as a receiver or transceiver) and much more! By the way, you must always remembered that the main function of AVR frequency counter is to use for measuring the frequency in a set period of time or the number of oscillation/pulses per second in a repetitive electronic signal. Therefore, you have to make sure that the LCD display need to be the standard industry 16×2 dot matrix module for the clearer display. Another advantage of using this AVR frequency counter is it requires low current single supply operation, where it can be… Continue reading

Universal frequency counter

Frequency counters are very popular and easy to build projects. This one is a AT90S8515 microcontroller and Lattice ispLSI2032 PLD based frequency counter. While microcontroller mainly takes care of communicating and data display, PLD counts incoming pulses and scales them down because of hardware 36bit counter implemented. When counter counts up – it generates an interrupt for MCU. Frequency counter has 5 operating modes: Mode 0: Frequency(IN-1), up to 2.4GHz (in resolution of 100Hz); Mode 1: Frequency(IN-2), up to 100MHz (in resolution of 1Hz); Mode 2: Frequency(IN-2), up to 10kHz (in resolution of 100µHz); Mode 3: Pulse Period(IN-2), up to 10sec (in resolution of 100nsec); Mode 4: Pulse Width(IN-2) up to 10sec (in resolution of 100nsec) And have three dedicated inputs for various cases: IN-1: ZIN = 50ohm, 10MHz-2.4GHz; IN-2(AC): ZIN = 1Mohm, 10Hz-100MHz; IN-2(TTL): DC-100MHz Frequency counter also has ability to communicate with PC via serial port. This way counter can log data to computer or be simply controlled by computer. Project files and source codes are available for download in project page. Continue reading