Smart Parking Lots

I have used PIC for different projects with ultrasonic sensor such as water level indicator and for robots with obstacle avoidance.

Hi i am an expert electrical engineer with almost 7 years of experience in this field. please have a look at my profile i assure you quality work and on time delivery. i have completed a number of projects here have a number of satisfied clients. please give me a chance to prove myself. regards

hi i am an electrical engineer. i have vast experience related to micro controller and its programing. i have done many embedded system projects. i have hardware experience regarding pic16f877A. let me know if you are interested. we can discuss further on chat.

Hi. I am a professional Electronics Engineer having expertise in Sensor interfacing with Micro-controllers. I have expertise on PIC16f877a. I have done a smart parking system project already. Contact me and lets start this project.

dear Sir i can do this project. I can assure you that if you work with me once, you will always work with me for these kind of projects.

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I can increase more functionalities in same money & duration. For more detail please contact me at mentioned details

great experience in this type of devices.

Hello, i am an embedded coder for more than 4years of experience working with a reputed multinational. worked on PIC24F microchip, and other controllers such as freescale, maxim, renesas etc. Have good experience of working on I2C, SPI, UART, ADC, LCD interfacing. Please message if i fulfill your requirements. Thank You!

I am a civil engineer. very well versed with auto-cad and designing. I might be new to freelancer, but not to designing.

Hi! I am an Electrical Engineer. I have proficient skills in Embedded Systems. I have worked with PIC and Arduino microcontrollers. I have also interfaced LCD and ultrasonic sensors with miconcontrollers so I can do the task for you guaranteed. Waiting for your response.

This is just an initial thinking process related to your project: 6 HC-SR04 2 pins (trigger, echo) total 12 pins, 6 on will need to be support interrupt on change. But only RB4-RB7 support that (only 4), it is a little bit trickier in this way, because also you need to send the count to the LCD display (only for 6 spots) There will be a way without using interrupts, but if you read the datasheet from HC-SR04 the min time is 150us and max time 25ms on the width of the echo signal (38ms without obstacles), then I think will be about 50ms per slot checking with a total of 300ms to check the 6 spots My idea without using the interrupt on change behavior is using a timer interrupt, and the system will have three states for detecting: TRIGGER (10us), WAIT_ECHO(unknown time), ECHO_INIT, ECHO_END (up to 38ms) Now suppose we feed the system with a 8MHz xtal, then will we have about 500ns or 0.5us per instruction (asm, not C), As you need to send the signal TRIGGER for 10us, the interrupt time need to be less than that number, I will suppose I want to have interrupts each 2.5us, then only 5 asm instructions per interrupts. For a 20MHz xtal, then will we have about 200ns or 0.2us per instruction (asm, not C), this will give us about 12.5 instructions. We can increase from 2.5us to 5us to get 25 instructions executed between interrupts. 38ms/5us = 7600 Now add that also you need to write to the LCD the results, the LCD has their own times too.