This PIC development board has been designed to develop RS485 based and DMX512 applications, the board has 28 pin SMD Pic micro-controller, RS485 chip for communications, all I/O line has pull-up resistor which can be soldered as per application requirement on particular port pins. In-circuit programming of PIC micro-controller can be achieved via a 6-pin header that is compatible with the Microchip PICkit2 or PICkit3. On board 3.3 V and 5V DC regulators allows using 3V and 5V PICS. This board support both 3.3V low power and normal 5V operation, supply selection with jumper closure. All I/O pins supported with parallel GND and VCC header connector for easy interface of any device or sensor and also can be used as address setting jumper by pulling high or low. Important for DMX512 Address.
PIC Development Board for RS485 & DMX512 Applications – [Link]
This is likely the first ham radio related project that I document here on this blog
But my very first PIC project was a beacon keyer that I made for my father, HB9BBD. That was in 2013. A beacon keyer is a great project to get started with microcontrollers since it’s not much more than a fancy way of blinking an LED.
iCircuit Technologies had produced the iCP12 usbStick, a mini size 28 pin USB PIC IO development board and a good tool for signal monitoring (as oscilloscope), data acquisition and circuit troubleshooting at 1mSec/Samples period.
The iCP12 usbStick is a PIC18F2550 based USB development board that comes preloaded with Microchip’s USB HID bootloader which allows users to upload an application firmware directly through a PC’s USB port without any external programmer. It provides access to its I/O pins through 0.1″ pitch headers. A slide switch is also provided on board to select the operation of the board in Bootloader or Normal mode.
The features of iCP12 are listed as following:
Mini size, easy interfacing, high performance and user friendly device
Used with PIC18F2553 28-Pin Flash USB PIC MCU
Excellent flexibility that allows user to expand the board with plug and play modules
13x IO Port (6x 12bit ADC pins, 2x 10 bit PWM/Freq/DAC pins)
Serial port emulation (UART Baud Rates: 300 bps to 115.2 kbps)
Supported operating systems (32bit/64bit): Windows XP ,Windows Vista, Windows 7, Windows 8, Windows 10, Linux, Mac OS X and Raspberry Pi
Maximum Voltage: 5Vdc
100mA current output at VDD pin with over-current protection
Green LED – power on indicator
2x LEDs (Green, Red) – status indicator
ICSP Connector – on-board PIC programming
Switch Mode Selection – Boot or Normal mode
The iCP12 usbStick board is shipped with a preloaded data acquisition firmware that emulates as a virtual COM port to PC. Thereafter, the communication between the PC and usbStick is serial. The firmware also supports basic I/O control and data logging feature. They provide a PC application named SmartDAQ that is specially developed to communicate with the usbStick and control its I/O pins, PWM outputs, and record ADC inputs.
SmartDAQ has a very friendly GUI with real-time waveform displays for 6 analog input channels. The time and voltage axes scales are adjustable. SmartDAQ can log the ADC data in both text and graphic form concurrently. One can utilize this feature to construct a low-cost data acquisition system for monitoring multiple analog sensor outputs such as temperature, accelerometer, gyroscope, magnetic field sensor, etc.
Microchip, the well-known manufacturer of microcontrollers and semiconductors, announced this week a new family of 8-bit PIC microcontrollers, the ‘PIC16F15386’.
The new PIC16F15386 family features a 8 MIPS CPU speed, with 2KB RAM and up to 28KB flash memory offered in 8 to 48-pin packages. It also has a dual UART, dual SPI and dual I²C interfaces, one 8-bit timer and two 16-bit timers.
Enhanced Mid-range Core with 49 Instruction, 16 Stack Levels
Flash Program Memory with self read/write capability
We’ve always offered a diverse portfolio of products with large market appeal,” said Steve Drehobl, vice president of Microchip’s 8-bit MCU division. “With the combination of the most requested features and peripherals by our large base of PIC MCU users, the flexibility in memory size and package options and the availability of MPLAB Xpress with MCC, we expect the PIC16F15386 family to be popular with experienced and first-time PIC MCU designers.
The PIC16F15386 is also compatible with the MPLAB Xpress IDE and the MPLAB Code Configurator, a graphical programming environment. The family includes 13 unique products that are offered in various package options including PDIP, SOIC, DFN, UDFN, UQFN and SSOP.
All products are available now for sampling and in volume production. Volume pricing starts at $0.33 for the product family.
Strobe provides regular flashes of light. Usually Strobes are designed using Xenon Tubes. Here is LED based simple solution that can be used as strobe for entertainment and events and also as warning signals. Project is based on PIC16F1825 micro-controller with two digit frequency display.
Project provides TTL output signal, frequency 1Hz-25Hz, Tact switches provided to set the frequency.
pinko @ blog.exrockets.com has build a mini GPS data logger based on PIC18F25J11 microcontroller.
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 size is 20mm x 27mm – less than a standard SD card as you can see on the picture to the right.
MINI PIC GPS DATA LOGGER WITH MICRO-SD CARD – [Link]
8 PIN SMD PIC development board is a full-featured development board and platform for 8-bit PIC® microcontrollers. This project is a versatile development solution, featuring several options for external sensors, off-board communication and human interface. Additionally, it offers ample room for expansion, making it an excellent solution for developers and engineers looking for a PIC development board. The 8 Pin SO8-SMD PIC Development / Evaluations Board demonstrates the capabilities of Microchip’s 8-bit microcontrollers, specifically, It can be used as a standalone demonstration board with a programmed part. With this board you can develop and prototype with all Microchip’s 8 PIN PIC microcontrollers which doesn’t required crystals (External Oscillator). On board connector for ICSP allows an easy programming. The board has configurable pull ups on all pins can be soldered or abandon as per requirement, All pins has solder Jumpers for pull down. Onboard 5V regulator, two tact switch, one output connector to interface with 12V Relay board or solid state AC or DC Relay. Board has small prototype area. We have considered PIC12F683 IC for this Board.
Atmel tinyAVRmicrocontrollers are optimized for applications that require performance, power efficiency and ease of use in a small package. All tinyAVR devices are based on the same architecture with other AVR devices. The integrated ADC, DAC, EEPROM memory and brown-out detector let you build applications without adding external components. The tinyAVR also offers Flash Memory for fast, secure and cost-effective in-circuit upgrades that significantly cuts your time to market.
The latest tinyAVR devices (ATtiny417/814/816/817) by Atmel combine AVR core with CIPs (Core Independent Peripherals). PIC microcontrollers with Core Independent Peripherals (CIPs) already raised the performance of 8-Bit-MCUs to a new level. Since the acquisition of Atmel by Microchip, this is the first time the company leverages features from both MCU families.
So, now the question is:
What Is CIP?
In fact, the term CIP or Core Independent Peripherals is pretty much self-explanatory. Microchip’s description of CIP is:
CIPs allow the peripherals to operate independently of the core, including serial communication and analog peripherals. Together with the Event System, that allows peripherals to communicate without using the CPU, applications can be optimized at a system level. This lowers power consumption and increases throughput and system reliability.
Core Independent Peripherals or CIPs are designed to handle their tasks with no code or supervision from the CPU to maintain their operations. As a result, they simplify the implementation of complex logic control systems and give designers the flexibility to innovate.
Ham radio is the use of radio frequency spectrum for purposes of non-commercial exchange of messages, wireless experimentation, self-training, etc. Developing a ham radio project may requires using an antenna analyser, a device that is used for measuring input frequency and impedance.
There are many types of antenna analysers such as Anritsu VNA Master, RigExpert, MiniVNA, and others. But these analysers are very expensive to buy. They starts from $500 up to thousands of dollars and they are also hard to hack. This guide shows how to construct and use a DIY HF antenna analyzer using Arduino for less than $50.
The AD9850 is a CMOS highly integrated device that uses advanced Direct Digital Synthesis (DDS) technology coupled with an internal high speed, high performance, D/A converter and comparator, to form a complete digitally programmable frequency synthesizer and clock generator function.
AD9850 module is a $9 stable, low drift VFO (Variable Frequency Oscillator) fed by a 125 MHz crystal clock. The module covers from 0 to 40 MHz, which are all the HAM HF(High Frequency) frequencies. There are 4 output pins on the device, 2 for Sine Waves (only one Frequency at a time) and two Square wave outputs. The blue pot on the board adjusts the duty cycle of the Square Wave Outputs but has no effect on the Sine Wave Outputs.
Signal Frequency output range: 0-40MHz
4 Signal outputs; 2 sine wave outputs and 2 square wave outputs
DAC SFDR > 50 dB @ 40 MHz AOUT
32-Bit Frequency Tuning Word
Simplified Control Interface: Parallel Byte or Serial Loading Format
Phase Modulation Capability
+3.3 V or +5 V Single Supply Operation
Low Power: 380 mW @ 125 MHz (+5 V)
Low Power: 155 mW @ 110 MHz (+3.3 V)
The VSWR (voltage standing wave ratio) bridge is an impedance bridge circuit, which is used to measure the ratio of maximum voltage (Vf+Vr ) to the minimum voltage (Vf-Vr) on a transmission line. The bridge will balanced (0 volts across the detector) only when the test impedance exactly matches the reference impedance. This bridge is easy and cheap to implement and works with up to few GHz frequencies.
The microcontroller works as an interface between the DDS and the PC, it receives the sweep parameters from PC, and then it reads the collected voltage and frequency to the PC for each sweep. There are multiple choices about the microcontroller type, you can use either Arduino Micro or PIC. If you choose Arduino, the cost of the project will be around $50, while the cost will be reduced to $20 when using PIC.
To display the results which are collected from the device, you need to develop a simple software and run it on the connected PC. The software GUI contains configuration buttons on the right side and 2-axis plane, which will hold the signal shape, on the left side.
If you want to make the project portable, you can replace the PC with a LCD display to show the collected data.
This project is open source, you can find and download schematics and code from here. You also can apply your ideas to enhance the project, such as amplifying power for accurate VSWR, adding bluetooth connection to use with tablet, increasing supported frequencies range, and more.