60MHz LCD Frequency Counter Temperature & Voltage Meter IF Offset (User definable) Read Frequency Counter value from UART Interface

 This board is Frequency Counter which was already assembled and tested.  Frequency measurement 1Hz to 60MHz and Auto Range.  Frequency Input Sensitivity 200mV to 300mV.  Frequency Measure cycle 1 second.  Frequency Measure Accuracy: Guarantee ±0.01%.  Onboard Microchip PIC16F883 (Crystal Oscillator 20MHz, +/-20 ppm), better than others onboard PIC16F628A (4MHz) Frequency Counter.  Power Circuit (TO-220, 7805, Vin=7V~16V, Vout=5V).  16x2 Character LCD Display Module HD44780 Controller blue black light.  Three Keyboards Circuit to select two Mode: (1)60MHz Frequency Counter +Temperature & Voltage Meter (2)60MHz Frequency Counter + IF Offset (User definable IF Offset)  The programmable Mode and IF offset parameters are stored in PIC16F883 non-volatile EEPROM.  Programmable display calculation: Direct, VFO+IF, VFO-IF, IF-VFO.  Display Voltage Meter & Temperature (You must buy Digital Temperature DS18B20 in additional).  Read Frequency Counter value from UART Interface: UART interface Circuit (VCC,RX,TX,GND Pin) :19200 bps, 8 bits data, 1 stop bit, 1 start bit.  Hyper Terminal which is free from Microsoft. to catch up the data to show on the screen  PCB Size: 83x48mm.

Press“Enter”=>Enter Setup Mode Function Press “Up” =>Frequency Counter +Temperature & Voltage Meter Press “Shift”=>Frequency Counter + IF Offset

I. 60MHz LCD Frequency Counter + Temperature & Voltage Meter (1) Display Frequency Counter 1HZ to 60MHz (2) Voltage Meter(Voltage Range =0V~55V) (3) Temperature measure range= -50˚ to +125˚C (You must buy Digital Temperature DS18B20 in additional).

MAXIM DS18B20 Pin Configurations

II. 60MHz LCD Frequency Counter + IF Offset (User definable IF Offset) (1)Press “Up” Select=> “Direct”, “VFO+IF”, “VFO-IF”, “IF-VFO” (2)Press “Enter”=>Enter IF Offset Value Function (3)Press “Up” or “Shift”=>Setup “IF Offset Value”

Frequency Counter LCD Display Rule: case "Direct": LCD Display Line1=>“VFO” case " VFO+IF": LCD Display Line1=>“VFO+IF” case "VFO-IF": if (VFO>IF) LCD Display Line1=>"VFO-IF" if (VFO“0” case "IF-VFO": if (IF>VFO) LCD Display Line1=>"IF-VFO" if (IF“0”

III. 60MHz LCD Frequency Counter to UART Data Read Frequency Counter value from UART Interface: UART interface Circuit (VCC,RX,TX,GND Pin) 19200 bps, 8 bits data, 1 stop bit, 1 start bit.

Note: If you use the “USB to UART TTL Cable module PL2303 Converter” connect to Computer, you cannot use V_In=7~16V otherwise the “USB to UART TTL Cable module PL2303 Converter” will be damaged.

Hyper Terminal which is free from Microsoft. to catch up the data to show on the screen

USB to UART TTL Cable module PL2303 Converter: (You must buy this Cable in additional).       

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Brand New and High Quality PL-2303HX USB to Serial Controller adopted Approximately 1m long cable 4 connecting wires, 2.54mm pitch type. red= 5V , black= GND , white= RXD , green= TXD Supports baud rate from 75 to 128000 Support Win 98 or above (Win 7 64-bit Supported) , MAC OS X or above , Linux Official Drivers for Win 98 or above (Win 7 64-bit Supported) , MAC OS X or above , Linux – (http://www.prolific.com.tw/eng/downloads.asp?ID=31) Drivers for Win Vista and 7 if you received CODE 10 with official drivers (http://www.r3cube.com/Drivers-software/PL-2303-Vista7-Driver-In staller.exe)

Note: USB to UART TTL Cable module PL2303 Converter: Red: 5V, Black: GND, White: RXD, Green: TXD.

System Circuit Diagram:

 LCD 16x2 Module Circuit

 PIC16F883 Circuit

 Power Circuit (Vin=7V~16V,Vout=5V)

 Voltage Input Circuit (Voltage Range =0V~55V) A1=Voltage Input*[10k/(100K+10K)] Ex: Voltage Input=45V A1(PIC16F883 AN0,Pin 2) =>45V*(10K/110K)=4.09V ADC Value=(4.09/5)*1024=838

 Frequency & RPM Input Circuit(fmax=50MHz) It was needed only an amplifier stage to raise the input signal level from 200-300 mV p.p. to about 3 volts p.p. A self biased common emitter amplifier produces a pseudo-TTL driving signal. The 10uH inductor in the collector lead helps extend the high frequency response. Any "fast" NPN transistor should be suitable. The basic idea comes from the AN592 Microchip application note: "Frequency counter using PIC16C5x" where you may find a simple software with implements a frequency counter using a PIC micro controller. I wrote a specifically designed software to improve the counter resolution, to handle the IF mode and value by means of an operating menu, to decode and edit the read frequency on an LCD display. The result was a simple and effective device.

Frequency Test Board Diagram & Report:

Note:  Frequency measurement 1HZ to 60MHz and Auto Range.  Frequency Input Sensitivity 200mV to 300mV.  Frequency Measure cycle 1 second.  Frequency Counter Accuracy: Guarantee ±0.01%.  Onboard Microchip PIC16F883 (Crystal Oscillator 20MHz, +/-20 ppm), better them others onboard PIC16F628A (4MHz) Frequency Counter.  74390=TI SN74LS390  Frequency Test Board OSC= 32.000000MHz

OSC=32MHz, Frequency Measure =32.000030MHz

OSC%10=3.2 MHz, Frequency Measure =3.200002MHz

OSC%100=320 KHz, Frequency Measure =320.001KHz

OSC%1000=32 KHz, Frequency Measure =32.000KHz

OSC%10000=3.2 KHz,Frequency Measure =3.200KHz