This circuit can be used to measure exhaust gas temperature in a furnace. The 10-bit LTC1091A gives 0.5°C resolution over a ooc to 500°C range. The LTC1050 amplifies and filters the thermocouple signal, the LT1025A provides cold junction compensation and the LT1019A provides an accurate reference. The ]-type thermocouple characteristic is linearized digitally inside the MCU. ..
This high power led mood light is based on PIC16F628 and the ability of this mcu to produce PWM pulses. Varying pulse width we can produce millions of color combinations using only the three basic colors. So only one RGB (Red-Green-Blue) led is capable producing a rainbow of fading colors. With the help of four switches we can handle all functions of the lamp. We can choose fading or jumping between colors, we can select a rainbow style or a random color changing behavior,.....
The WWVB signal is broadcast as a 60 kHz carrier that is AM modulated with a time code frame that is updated once per minute. The data rate is one bit per second. Along with time code information, the data frame also contains synchronization bits, calendar data, UT1 correction, leap year, and leap second data. The clock design presented here only decodes the time data and daylight savings correction data. The software could easily be modified to include decoding of the.....
Electrical potentials are generated by muscle when there is movement. This Signal can be pick up by electrode to form EMG. For my Final Year Project, I did an amplifier and signal conditioning circuit for EMG. Attached below is the schematics for the Amplifier. Disposable surface electrode are used to pick up the signal. The amplitude of the signal pick up is low, so amplification is needed to measure the detected signal. A differential amplifier is needed because of the.....
All resistors are 1/4W.The circuit is powered by 9...15V DC or AC. When In Circuit Programming (ISP) connectors are used, is possible the programmer to be powered from target?s power source. Diodes D2 and D6 protect the regulator LM7805, when target?s power is used. ?PIC JUMP? is used to switch between Microchip?s PIC and ATMEL?s microcontrollers. With jumper ON only PIC can be programmed, while OFF can program ATMEL?s microcontrollers. If you don?t need to program PICs,.....
On board the AVRs that can be programmed are those in the schematic. For other members of AVR family or the rest programmable ICs that Ponyprog can program, there is the J1 connector (CON10) which allows expanding the programmer's hardware. See Ponyprog's site for other's ICs Ponyprog circuits. The JUMP1 jumper is there to connect the crystal's circuitry to the 8-pin AVRs or to disconnect it. Some AVRs have internal RC oscillator and an external XTAL is not allowed or.....
The fan has mechanical timer for 0-180mins. One day it broken. So I got the idea to use Nitron chip to replace the mechanical timer. Someone may ask me why so complicated timer made by microcontroller chip? Actually we can build a timer with 555 and a 14-stage cmos counter! The 555 runs astable with time constant controlled by RC and for long period timing we can divide the output frequency of 555 by a cmos counter. That was my homebuilt timer 20 Yrs ago. Such circuit.....
This is a simple use of the PIC 16F84 about a diode tester. Test procedure : We set «1» to PB0 and «0» to PB3. If diode is ok and opens, then at PA0 we have «1». If PA0 is «0», then the the diode has problem. With the program we manage what the PIC will do in each situation . If PA0 is «1», green led lights wich means that the diode is OK and if PA0 is «0» red led is lighting and the diode is problematic..
The key to understanding any circuit is "divide and conquer" - break it down into functional blocks. There are 3 main blocks in the Tree. The first, the power supply, is very straight forward. 9Vdc should be applied to SK1. Reverse polarity protection is provided by D1. U2 then regulates down to 5V for the LEDs and the logic. Bypass capacitors C4 and C5 ensure the 7805 remains stable. Next is the microcontroller or MCU. In previous projects, we used the Atmel AT89C2051......
Next is the microcontroller or MCU. In previous projects, we used the Atmel AT89C2051. However, the I/O port structure is not quite suitable for this application so we have used the similar Atmel AT90S2313. The main feature influencing this decision is that the 2313 outputs can be "turned off" while the 2051 outputs always have pullups enabled. When I said the 2313 is similar to the 2051, I was referring to the arrangement of I/O pins and their functions. Inside, the two.....
A little board with most of Microchip kit, but less parts then all these boards. Only the basic components to get the microcontroller up and running the Microchip USB Library examples. PIC18F14K50 is a really basic device and after some research I found what you can do and what you can not do with it: What you can do: USB HID (Human Interface Devices) like mouse, keyboards, sensors, serial-usb converters, etc. What you can not do: USB storage devices, like USB flash.....
A series of five short pulses blasted by the microcontroller only has 5V amplitude, which will be attenuated down to less than 20 mV when received by the receiver circuit. Hence, LM311 voltage comparator was used for signal amplification before transmitting the signal. LM311 was used instead of regular operational amplifier since it has faster switching speed. Low-to-high and high-to-low level output response times were only 115ns and 165ns respectively, which was more.....
The board has been initially developed to learn with CAN, so a CAN transceiver is available (IC4). The CAN transceiver comes from Maxim, but some other manufacturers provide some compatible CAN transceivers which can be used. An RS232 transceiver is also mounted on the board to get an RS232 interface, to connect the board to a computer. It could be used for debug purpose for example. Both transceivers are connected to the microcontroller throw jumpers, so it is possible to.....
I am planing to design the x86 board for some of my application that needs more computing capability. One of the feature that I need to add to the x86 board is USB port. I found the ASIC that enables 8-bit MCU to interface USB easily from Future Technology Devices International: FTDI. The USB controller chip is FT245BM. Fortunately near my campus, the Astron Logic company sells the ready board for such USB chip with connector. So I bought it to learn how to interface with.....
A pedometer is a device that counts the number of steps taken by a person and calculates the distance traveled by multiplying the number of steps by the length of the step. Here`s a design solution for building a pedometer using the AVR MCU. The circuit not only combines all of the features of the traditional pedometer, it saves power (low power consumption is a must for a portable device) as well. The design also includes instantaneous speed measurement...
Few years back, I had been working on a project for solar auto lighting. The light will turn on when the the solar panel voltage drop below a set point indicating that it is dark. The detection is done by using D2 in the schematic. The zener diode value will be adjusted so that the transition between the switch depends on the amount of light the panel receive. Relay K1 is used to switch the load and the battery. If the battery power fall below a set threshold, the relay.....
Build a timer with Motorola Nitron MCU and using ICC08 to develop c program. Loader schematic also included. New s-record for 8-pin 68HC908QT2! The fan has mechanical timer for 0-180mins. One day it broken. So I got the idea to use Nitron chip to replace the mechanical timer. Someone may ask me why so complicated timer made by microcontroller chip? Actually we can build a timer with 555 and a 14-stage cmos counter! The 555 runs astable with time constant controlled by RC.....
Build a simple and cheap cable for programming new series ATMEL 89S51/52/53/8252. New layout made with single-side PCB! have modified Asim`s ISP loader to be a simple hardware for programming the new series 89Sxxxx MCU from ATMEL. I tested program 89S51 and 89S52 with new version ISP V3.0a, it works very well...
I am very happy to use sdcc for writing firmware of my project. The compiled code is very compact and nice. After I succeeded writing a new firmware of xtimer and Easy-downloader V1.1 with sdcc. I cannot stop preparing a new page that gives the idea how to use sdcc and of course it`s time to renovate my old project with orcad. For now I can design the hardware, draw a schematic, write the firmware and layout the pcb. So I think why shouldn`t begin with Easy-Downloader......
The program loaded in the 12F675 device which has no osccal value will force a pulse on GPIO.4 and it will make a loop while increasing the osccal value internally. GPIO.5 will send the current osccal value used for each pulse sent. Because the device has no calibrated osccal value, the pulse will be variable. The circuit will wait until it receives the correct pulse. When the correct pulse is received, it will stop the test and display the osccal value used when the.....
Operational Amplifiers
Computer Systems
Oscilloscopes
Transmitters & Receivers
Sensors & Detectors
ANSI Standards
Low Frequency Amplifiers
Power Amplifiers
Number Systems
Regulated Power Supplies
Analogue Filters
Digital Gates
