We're putting together a network of 10 environmental sensor stations that connect to a central terminal (ie. a PC). Each sensor generates about...

We're putting together a network of 10 environmental sensor stations that connect to a central terminal (ie. a PC). Each sensor generates about 500 bytes/sec. Unfortunately RF is not an option, so we have to use a wired network. The maximum distance between sensors is 1 mile. We'd like to be able to run an IP network if possible. Fibre-optic cable is the first option that comes to mind b...

HI I m Sridar new member of this group. I wish u all happy new year. M fresh B.E. Electrical and Electronics Engg. graduate. Now m...

HI I m Sridar new member of this group. I wish u all happy new year. M fresh B.E. Electrical and Electronics Engg. graduate. Now m doing Embedded system and design course. Can any one clarify my queries ? 1.I wish to do my project on finger print sensor as part of my course. I dont know which type of sensor is effective to use(whether optical, thermal or capacitive) 2. Project is ab...

Any guys have image sensor experience? The image I'm going to use has to be in grayscale and down sampled. As for trying to convert the...

Any guys have image sensor experience? The image I'm going to use has to be in grayscale and down sampled. As for trying to convert the image into grayscale form i was thinking whether that i can use a image sensor with a output format of Y'CbCr instead of RGB. Then i'll using the Y' for the grayscale since Y' can be translated into by 0.9*R+0.59*G+0.11*B which is in fact the grayscale f...

Now I am doing a pic thermometer which use the LM19 temperature sensor to measure the temperature and display on the 2*16 LCD...

Now I am doing a pic thermometer which use the LM19 temperature sensor to measure the temperature and display on the 2*16 LCD without backlight. And I have a pic18f45k20 microcontroller chip and 4504N adc converter. I have connect the temp sensor to pin 9 of the pic18f45k20. Now I just want to ask who can give me help with the codes to let this system works. Thanks.

A research, Which digital and wired communication system would you use for the following robotic system. A system composed by a PC/104+ (it...

A research, Which digital and wired communication system would you use for the following robotic system. A system composed by a PC/104+ (it is just a very compact standard PC) with Xenomai (or maybe RTAI), and some sensor nodes (something like 12, but could vary a lot). These sensor nodes are basically composed by a DSP/MCU/DSC (not the same one on every node) and some sensors and actua...

Hello, I am currently working on a project using the Omnivision OV6620 CMOS color image sensor (the same one used by the CMUcam). I have...

Hello, I am currently working on a project using the Omnivision OV6620 CMOS color image sensor (the same one used by the CMUcam). I have the OV6620 interfaced to an Atmel AVR microcontroller, and I am able to extract images from the camera and display them on a PC (through a PC app I wrote...the images get sent up over the serial port). Anyway...my question has to do with the Bayer image ...

Hi all, I'm looking for a fingerprint scanner (or sensor? confused!) that I can interface with a MCU, authenticate with a reference and play...

Hi all, I'm looking for a fingerprint scanner (or sensor? confused!) that I can interface with a MCU, authenticate with a reference and play around with it. No major requirements here, just a hobby project. Question really is what 'exactly' should I be looking for to search? I tried searching in the forums, but most of the 'fingerprint' posts are quite old, so posted here to get info on lates...

Greetings, I am planning a project that involves a remote sensor (eg, temp) that sits idle but has to send an alert when the trigger goes off....

Greetings, I am planning a project that involves a remote sensor (eg, temp) that sits idle but has to send an alert when the trigger goes off. The requirements are: - Low power: has to be able to remain idle for about 1 week if needed. - Has to transmit over wireless from across town (Atlanta, 30min drive or so). - In the fufture, has to be able to send an image from a camera. BW is f...

I'm trying to interface a SHT21 humidity sensor to a PIC (and learning C18 along the way, MPLAB, C18, PIC18LF44K22). A 16 bit serial value,...

I'm trying to interface a SHT21 humidity sensor to a PIC (and learning C18 along the way, MPLAB, C18, PIC18LF44K22). A 16 bit serial value, S_RH, is read from the sensor. To convert this value into relative humidity, RH, it needs to be inserted into an equation. RH = (125 x S_RH)/ 2^16 - 6 The data sheet gives a test value of S_RH = 25424 giving RH = 42.5% which works nicely. ...

What I need is a minituare temperature sensor that can sense the room temperature between 10C to 40C, precision of up to 0.1C. Has anyone seen...

What I need is a minituare temperature sensor that can sense the room temperature between 10C to 40C, precision of up to 0.1C. Has anyone seen such information? Thanks.

Hi, I'm involved in a project where we are building a still image capture device. We have a CMOS image sensor (Pixart PAS106B) connected via...

Hi, I'm involved in a project where we are building a still image capture device. We have a CMOS image sensor (Pixart PAS106B) connected via I2C to a philips lpc2106 (Arm 7) microcontroller. I'm able to capture images without trouble, however, I notice - depending on the ambient light - my image is either too light or too dark. To correct this problem, I want to write a small (hopefully ...

Do you know any small size, light weight distance sensor with the following specs; * Range : 10cm to 1000cm (10meter ) * Rate : 50...

Do you know any small size, light weight distance sensor with the following specs; * Range : 10cm to 1000cm (10meter ) * Rate : 50 Hz (50 measurements/sec) * Accuracy : 1cm * Must operate on any surface (except transparent surfaces like glass) * Power requirement : Less than 5W * Weight : Lighter than 500grams * Vibrartion sensitivity : Must operate 0-500Hz ...

I need to interface a minimum of 32 (maximum of 64) 14-bit ADCs to an Intel PXA255 XScale processor. Each ADC is connected to an individual...

I need to interface a minimum of 32 (maximum of 64) 14-bit ADCs to an Intel PXA255 XScale processor. Each ADC is connected to an individual linear Hall Effect sensor. The sensors are distributed over an area of approx 2 sq metres. I want an ADC near each Sensor (for signal integrity reasons), so multi-channel ADCs are not suitable. The PXA255 has I2C and SSP ports available. Does anyone...

Hi all, I'm looking to purchase the C3088 CMOS imaging sensor. I plan to interface it with a PIC microcontroller in order to do some...

Hi all, I'm looking to purchase the C3088 CMOS imaging sensor. I plan to interface it with a PIC microcontroller in order to do some image processing on-board my robot. I was wondering if someone could take a moment and answer a couple of questions for me. (1) Would this be reasonable code for capturing a frame of data from the C3088 row=0; col=0; // generate interrupt if VSYNC ...

Hello All, I am trying to build a 8051 based single board computer. I am planning to have an ADC (0804) and serial port drivers ( 1488 and...

Hello All, I am trying to build a 8051 based single board computer. I am planning to have an ADC (0804) and serial port drivers ( 1488 and 1489) on it too. The project is to read the voltages form the temparature sensor and update a website portal using serial port. And I have following worries and questions 1. Let suppose the temparature sensor updates itself every one second. The 80...

I want to develop a cheap wireless sensor node with short range (500ft). I am a novice in the field of wireless, therfore i dont want to work...

I want to develop a cheap wireless sensor node with short range (500ft). I am a novice in the field of wireless, therfore i dont want to work on designing an antenna. I am looking for small and cheap full/half duplex modules with low datarate to attach to my digital circuit. Are any such modules available

Hello, I've have a temperature monitoring system using Maxim DS18B20 temperature sensors. To verify correct temperature, I compare the sensor...

Hello, I've have a temperature monitoring system using Maxim DS18B20 temperature sensors. To verify correct temperature, I compare the sensor crc (Byte8) in the sctatchpad with the calculated crc. Ninety nine percent of the time, the CRCs match and everything is fine, but occasionally, I get a CRC mismatch. After verifying against an online CRC checker I see that the sensor crc i

There is a network of ~100 wireless sensors, communicating to a single host. All sensors are located within ~50..100m from the host in the...

There is a network of ~100 wireless sensors, communicating to a single host. All sensors are located within ~50..100m from the host in the typical urban environment. Ideally, it would be desirable to poll each sensor at least 10 times/sec. When polling the sensors, we have to get just several bits of the status information from each sensor. Problem: as sensors are battery powered, the...

I'm working on a project with an MSP430 that serves to capture sensor data from an external ADC. Capturing the raw data stream is relatively easy....

I'm working on a project with an MSP430 that serves to capture sensor data from an external ADC. Capturing the raw data stream is relatively easy. My stumbling block is in finding a way to properly correlate when each data point was received so that I can generate accurate graphs when this data is pulled from the device. One of my sensors is an EKG which would require at least 250 H

Has anyone any experience of running an I2C bus from a PCB to a remote I2C device ? I am thinking of connecting a remote Dallas Semiconductor...

Has anyone any experience of running an I2C bus from a PCB to a remote I2C device ? I am thinking of connecting a remote Dallas Semiconductor I2C temperature sensor IC to a micro over a length of 4 or 5 metres of wire. The temp sensor would be fixed to the ceiling to measure room temperature and the micro would be in a monitoring / control box on the wall. Could I run this at the typical ...