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Extending the RAM memory of a PIC microcontroller
Dilshan designed a RAM memory extender for PIC microcontrollers. The circuit uses some logic ICs and SRAM memory modules to extend the data memory of a PIC. The designer provided source code for this project written for the MikroC compiler. With this given schematic user may be able to address RAM space up to 192KB. But this can be extended.
10 or more switches using a microcontroller
There are several ways to read multiple switch inputs using a reduced number of microcontroller-unit (MCU) pins. For example, you can use an analog MCU pin to read multiple switches by assigning a unique voltage to each switch through a resistor network, or you can use a one-wire device, such as the Maxim DS2408 8-channel addressable switch. The f
MICROCONTROLLER BASED AUTOMATIC ROOM LIGHT CONTROLLER
This Project Automatic Room Light Controller with Bidirectional Visitor Counter using Microcontroller is a reliable circuit that takes over the task of controlling the room lights as well us counting number of persons/ visitors in the room very accurately. When somebody enters into the room then the counter is incremented by one and the light i
MSP430 Ultra-Low Power 16-bit Microcontroller
MSP430 Ultra-Low Power 16-bit Microcontroller
As found in SLAA458, the revised pulseoximeter application, I`ve attached an image of the USB schematic that is used to output collected data. I just had a few questions about this schematic. 1) What do J3 and J6 correspond to I can see the corresponding node names on the Ft232BM chip on J3, but these two are not present in any other schematic of
Control A Relay from PIC Microcontroller
Simply you can control a relay through Pic Microcontroller. See a simple circuit for controlling a single relay with pic 16f628. When RB5 port of pic become High the relay will operate. This Circuit works with non-latching ralays(commonly used relays are non-latching)
Microcontroller interfacing with RS 232
Standard serial interfacing of microcontroller (TTL) with PC or any RS232C Standard device, requires TTL to RS232 Level converter. A MAX232 is used for this purpose. It provides 2-channel RS232C port and requires external 10uF capacitors.
ISP Programming Kit for AT89S52 and AVR series Microcontroller
Now you can burn microcontrollers in your home with less cost of making AT89S51 series microcontroller burning IC kit. AT89Sxx series IC`s have inbuilt ISP (In System Programming) module so we can burning microcontroller easily. Here is the simple board circuit for making of AT89Sxx series kit for burning hex file into on-chip. for my project i ha
How carry on the intersection of SPICE and model and 8051 MCU in coordination with emulation under the NI Multisim
Multisim is the simulation software of circuit based on SPICE, SPICE Simulation Program with Intergrated Circuit Emphasis lay particular emphasis on the simulation program of the integrated circuit Abbreviation, it is here 1975, from University of California Berkeley branch school development. In Multisim9, needs to install MultiMCU and...
ISP microcontroller PLC implement method
It is obvious, a slice of SM2965 includes canonial 80C32, FLASH, E2PROM 28SF512, SRAM static data storage And WDT watchdog`s timer SM2965 is that the cost performance is extremely quite high The one piece Computer. And its ISP characteristic makes FLASH E2PROM can be regarded as the space of procedure, can also keep the data like...
The embedded microcontroller MC68HC912B32 background debugs the mode to design
With the wide application of Flash technology on the microprocessor, make the one-chip computer have revolutionary changes in developing and employing the means, from the traditional simulator ICE Popular JTAG up till now, designers are looking for lower development means of a kind of transplantation higher, expenses easy to more use constantly. W
LCD Display with Microcontroller
Here I have described how to connect a 16 by 2 LCD display to a microcontroller. Here I have demostrated it with very common pic 16F877A. This is the circuit diagram. Here I haven`t showed the power supply and oscillator connection for pic and LCD. LCD normally have 16 pins. If you carefully observed you can see number 1 or 16 have printed near th
Simple Circuit Interfaces 1-Wire Temperature Sensor To A Microcontroller
Temperature-indicator and temperature-based products have generated wide interest. There are numerous applications for such devices with many possible solutions, each with its own advantages and disadvantages. This idea discusses a sensor interface that offers high accuracy while using less board real estate. The article also discusses some softwa
Whats Better For Timing Chores: A 555 Or A Microcontroller
Micro or analog? These days it is getting harder to choose. The 555 timer was the benchmark of flexibility. How does it fare today?.
Remotely Programmable RTC-Interfaced Microcontroller for Multiple Device Control
This project based on Atmel AT89C52 and Dallas real-timeclock (RTC) chip DS12887 can be used to control and remotely program the switching operation of 24 electrically operated devices. The devices can be switched on/off at precise times repeatedly every day, every month. The microcontroller can be programmed for device control using a normal Phil
contruction of personal Radar System using PIC MIcrocontroller PIC18f452
Personal Radar System using PIC MIcrocontroller PIC18f452 is a microcontroller hobby project. The circuit diagram of radar is attached here below seemed a little bit simple schematic but you need careful reading of PIC18f452 radar circuit to avoid any damage. The project of personal Radar System using PIC MIcrocontroller PIC18f452 uses three main
Microcontroller Voltmeter / Ammeter with LCD
Rectifier bridge voltage. See U2 element you used data sheet to know about maximum voltage it can work properly. On the other hand the minimum voltage on that pin mustn`t drop bellow c. a. 9V, or 6. 5V if low drop type U2 and U3 voltage regulators were used. Multimeter is suitable for voltage and current measurement in PSU, where current sense...
LCD CLOCK USING 8051 (89s51) Microcontroller
This is a real time clock by using 89c51 micro-controller, clock`s data format is hour:min:sec, and it is displayed on 16x2 LCD, the code has been tested and compilled on Keil uVision compiler, circuit diagram for the project is shown below.
avr Control 5V buzzer using mcu and a single 5 V power supply
A PB-12N23PW-05Q buzzer and I`m trying to use it with ATmega 162. I can`t connect it directly to pin, because from what I`ve read from 162`s datasheet, it can source at most 20 mA. The buzzer takes 50 (or around 25, if we take a look at the graph), so I don`t think I can just directly connect it to the microcontroller. My initial idea was to...
avr Driving piezo buzzer from MCU pin
microcontroller How does this power supply circuit work? (MCU + LM317)
The filter R1, R2 and C1 integrate the PWM waveform. But what is the point of the op-amp It looks like a non-inverting amplifier to me, with the gain set by R6 and R7 - if I`m not mistaken. But why does the integrated DC voltage need amplification Perhaps, I don`t understand that part because I don`t understand how the Lm317 is working in...
Using microcontroller as oscillator for high voltage power suppy
Using the 555 timer as an oscillator in the high voltage power supply section. Can the design be changed to use an output from the micro-controller to generate an oscillating signal instead of the 555. The first question is that would such a design work If it works, is there a particular reason why a 555 timer is used in the design
microcontroller 12V relay circuit converted to 5V relay under uC control
The BC547B has Vcbo=50V, Vceo=45V, Vebo=6V, where-as the BC548 in original circuit has Vcbo=30V, Vceo=30V, Vebo=5V, rest of the parameters being pretty same as per datasheet (hFE:220-450). 1HP Water pump (220VAC, 800W) - One thought is to use higher current rated (e. g. 30A) relay. But, I think I need to worry about EM feedback which might cause...
microcontroller Seemingly unstable basic PIC18F2550 circuit
The LED blinks as intended, then stops for an arbitrary time, flashes again a different number of times, off again etc. There doesn`t seem to be any cyclic behaviour to it. It starts working without any external input (i. e. nudging it) so doesn`t seem like a loose connection either. I realise the second Vss pin isn`t grounded in the schematic,...
power supply Transistor current limiter microcontroller controlled
Rsense would cause Q2 to conduct if at a threshold (0. 65V assumably) and Rbias will determine how much it will be limited, however that is unclear to me, especially if Rsense will be somewhere highside and just turning on Q2 with my uC seems to not do anything (in simulation at least) How would I come up with the formulas for a variable limit...
microcontroller Analog to Digital Converter and Negative Voltages
Using the ADC on an ATtiny24 to record a AC signal. The ADC has a range from 0-3. 3V. I`m using a precision rectifier to get rid of the negative portion of the signal. I`ve attached a picture of the circuit I`m using for the rectifier. I`m using an LMC6484 as the op-amp with 3. 3V to the V+ rail and 0 to the V- rail. I`m using 1N4004`s as the di
microcontroller Which schematic is better for keypad connection to an MCU
microcontroller Driving low-voltage H-bridge directly from MCU
Drive a small (3. 6V, <1A) brushed motor bidirectionally with a PIC MCU. My available space is extremely limited, so I`d like to use a single 3. 6V power supply for both the motor and PIC, and a minimum of drive circuitry. I haven`t found a dedicated motor driver IC that operates at this low voltage, so a discrete H-bridge seems the most...
How to Wire a PIC Microcontroller
I managed to program my PIC 16f627 to turn on three LEDs when push button (trigger button) is pressed and start a shut down sequence (basically each LED toggles off one after another with a 5 second delay in between) when another pushbutton is pressed (reset button). I`ve been testing this on a Velleman`s K8048 PIC Programmer/ Experimentat
microcontroller How can I measure battery voltage with my MCU
Currently using the PIC24FJ128GA010 and I am planning to use Input/Output port to connect my 4. 2 V LiPo battery and to check if the voltage value doesn`t go below 3. 7 V. You should avoid digital. You have two options, use an ADC or use an Analog comparator. The last on one should be preferable if you only need to check if the voltage dropped
mosfet Turning a microcontroller on with a flip flop
The goal is to be able to turn on and off the load (an 8051 based uC) by pressing both switches. When the uC turns on, it sets PWR high, and then when the switches are pressed again, pin 4 of the flip flop goes low, turning off the boost regulator and uC. The issue that I`ve been having is that in the off setting (pin 4 low), the PWR pin is held a
microcontroller Generate a reset signal from a falling edge trigger
Microcontroller design where the mcu is placed in hibernation mode, and can only be awoken by a pulse(high-low-high) signal on the reset pin. (active low) As a wake-up source i`m using an accelerometer or an external RTC. The idea is to have the accelerometer trigger an interrupt, that drives an interrupt pin low. The same goes fo
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Ultrasonic distance finder circuit
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is measured. There are three main categories of distance measurement methods in use: a) By...
Simple Metal detector circuit with CD4030
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to find something potentially valuable, hidden a few centimeters below the soil. So many...
Fully automatic watering circuit for flower pots
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This circuit comes as a solution to this problem. Depending on humidity of the pot at...
Simple deep searching metal detector circuit
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the circuit of this metal detector, it is possible to detect a metal coin in depth of 90 to...
Sub-Harmonic Bass Converter for Electric Guitars
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound, such as filtering or distortion. Instead, a frequency division system produces outputs...
Echo Depth Sounding Sonar for Boats
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the calibration of the rope. This arrangement still exists in some yachts. The big...
100W HiFi Audio Amplifier Circuit
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power supply must be symmetrical so that no electrolytic capacitors are needed at the outlet....
Plant-Pot Water Level Indicator Circuit
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower. The circuit of the device is shown in Figure 2. The water detection is made from the bottom...
Analogue Sound Preasure dB-Meter Circuit
The best human ear can capture sounds from 20Hz to 20KHz. These limits are known to be the broadest that can exist. Normally the normal limits range from 100Hz to about 13KHz and depend on the age and health of the individual. We for our measurements and to have a good accuracy we will get the limits of 20Hz to 20KHz. A sound to be heard does...
DIY HV Variable Capacitor
DIY PMA Alternator Plans
Digital Signal Integrity