miniSpartan3

The miniSpartan3 is our new, low cost, tiny, FPGA kit. It starts at just $25, and there is a more powerful FPGA chip available for $35. Features: The Spartan 3A XC3A50 FPGA ($25), or the Spartan 3A XC3A200 FPGA ($35) from Xilinx. An on-board USB JTAG Programmer to power and program your FPGA. An on board USB to Serial Interface. One HDMI port. 41 digital I/O pins. A 4-channel analog to digital converter run ...

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Teardown and experiments with a Doppler microwave transceiver

I got a couple of Microsemi’s C900502 10.525 GHz X-band Doppler radar motion sensors a while ago. This batch was made in UK and had “UK patents 2243495 and/or 2253108 apply” printed on the case. I have seen a teardown of an HB100 Doppler radar module before and was wondering if I this one is any different inside. The C900502 transceiver has a very sturdy metal casing. It is measured at roughly 5cm by 5cm by ...

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OCTAVO CREATES A 1GHZ COMPUTER THAT FITS INTO A 27X27MM SIP PACKAGE

The OSD335x C-SiP System-in-Package (SiP) developed by Octavo, is a concept package that is modeled on its previous Sitara AM335x based SiP by including up to 16GB eMMC, an oscillator along with 1GB DDR3, PMIC, LDO, and EEPROM. The OSD335x C-SiP, is the most consolidated System-In-Package (SiP) module ever made. Modeled like its predecessors, the OSD335x C-SiP incorporates the Cortex-A8 based Texas Instrume ...

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UART Example for PIC16F887 microcontroller using CCS PIC C compiler

The microcontroller PIC16F887 has a build in USART (Universal Synchronous/Asynchronous Receiver/Transmitter) module. This module can be used as UASAT or UART. This small post shows an example for the usage of the UART protocol with PIC16F887 microcontroller. Hardware Required:   PIC16F887 microcontroller MAX232 -- datasheet 4 x 10uF polarized capacitor Female COM port Breadboard 5V power source Jumper ...

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Unipolar Stepper Motor Control Example with PIC12F1822 Microcontroller

This topic shows how to drive 5V unipolar stepper motor in 3 modes one-phase, two-phase and half step. The microcontroller used in this project is Microchip PIC12F1822 and the motor drive circuit is ULN2003. Usually the unipolar stepper motor has 5 wires one for motor supply and the other for coils. This motor has 4 coils and they are connected as shown in the figure below: Unipolar Stepper Motor Control Ex ...

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To Build the World’s Smallest Atomic Clock, Trap a Nitrogen Atom in a Carbon Cage

The Norwegian explorer had set a new record for the closest approach to the North Pole, and now he was moving quickly over unbroken sea ice toward Cape Fligely and home. But then came a sickening realization: In his eagerness to break camp, he had forgotten to wind the chronometers. He had lost track of precise time, and thus the ability to track his longitude. Although Nansen couldn’t have lost his positio ...

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Making my 32kHz Crystal Oscillator Actually Oscillate

It wouldn’t go. I messed about changing component values for while, then decided to actually try to understand the circuit. Now for an oscillator to work, we need an amplifier with a gain of greater than 1, and a phase shift of 360 degrees to get positive feedback. The circuit above is an amplifier, with the crystal network connected between the collector output and base input. We get half of the 360 degree ...

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Making my 32kHz Crystal Oscillator Actually Oscillate

It wouldn’t go. I messed about changing component values for while, then decided to actually try to understand the circuit. Now for an oscillator to work, we need an amplifier with a gain of greater than 1, and a phase shift of 360 degrees to get positive feedback. The circuit above is an amplifier, with the crystal network connected between the collector output and base input. We get half of the 360 degree ...

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Test For Presence of Internal Oscillator Calibration Word for PIC12F629

Description The PIC 12F629 and 12F675 devices have an internal 4Mhz oscillator that enables the devices to be used without an external crystal or RC network.  This frees up one or two pins for I/O use and allows the device to be built into minimum component count designs. Problems arise if by accident or otherwise, the factory programmed oscillator calibration word, located at program memory address 0x3FF i ...

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Blink LED with XC8 compiler using external Oscillator

In the simple tutorial we are going to blink few simple led with PIC18F microcontroller, using an external 20MHz crystal oscillator and the '__Delay ()' function of XC8 Compiler. Most of the previous tutorials here dealt with internal oscillator of pic18F4550 where mostly the delays were generated with simple for loops. However those who wish to directly use the default __delay function, it becomes an insta ...

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