Hi Adam, I appreciate your reply. I'll do my best to describe what is currently completed, and what needs to be done. The 'associated electronics' are what is currently on the board to 'bring everything together' (i.e. batteries, reset switch, lcd connections, sensor connections, etc.). The sensors just output a voltage if the 'sense' a magnetic particle circulating with a 1 cm proximity. The sensors that I am using are from Banner Engineering, they are D10 proximity sensors (part # 62379, model D10DNFP), Data sheet can be found at: http://info.bannersalesforce.com/xpedio/groups/public/documents/catalog/ 75272_06.pdf#page=5 I've gotten all but 1 of these (for simple testing) without the numeric display. I don't have a schematic of the board. It is being shipped back to me from the UK and I should have it by next week. If you are still interested at that point, I'll send the schematic. The pic chip that is currently on the board is a PIC16F628. Here is what I need each sensor to accomplish, and then display the info on the LCD. Here is the breakdown of the output for each sensor. Sensor 1 will be used for 2 events (if possible). The first event is to start the time for the control loop. The second event is to end the time for the control loop and display the elapsed time down to the .1 seconds. This control loop should take between 2 and 5 seconds. There should be an error if it takes more than 5 seconds and require a reset. If we could put something on line 1 like 'Error - not detected. Reset unit.' If it is less than 5 s, then display the elapsed time on line 1, i.e. '4.8s'. The time of the second event of Sensor 1 will also be used to start the elapsed time for the "unknown" path. Sensor 2 will be the event for the end time of the "unknown" path. Then calculate the elapsed time and display it after the known elapsed time on line 1. (in other words, subtract the time between the second event on sensor 1 from the time of the event recorded by sensor 2) I don't know how many elements are on each line of the LCD, but maybe start this unknown elapsed time at 1,10 or something like this. Then line 1 would look like '4.8s 2.1s'. Sensor 3, if this sensor is activated, simply display on line 2,1 of the LCD 'back'. This indicates that the particle was circulated at the back side of the phantom. Sensor 4, if this sensor is activated, simply display on line 2,6 of the LCD 'out'. This indicates that the particle was circulated at the outside of the phantom. Sensor 5, if this sensor is activated, simply display on line 2,10 of the LCD 'in'. This indicates that the particle was circulated at the inside of the phantom. Sensor 6, if this sensor is activated, simply display on line 2,13 of the LCD 't'. This indicates that the particle was circulated at the top side of the phantom. Sensor 7, if this sensor is activated, simply display on line 2,15 of the LCD 'h'. This indicates that the particle was circulated at the high side of the phantom. -----Original Message----- From: piclist-bounces@mit.edu [mailto:piclist-bounces@mit.edu] On Behalf Of M. Adam Davis Sent: Thursday, November 16, 2006 8:30 AM To: Microcontroller discussion list - Public. Subject: Re: [BUY] So it sounds like you need the device to report which proximity sensors were triggered at what time relative to the time the first two sensors were triggered? This information should simply be shown on the LCD display? I'm interested to know what you mean by "associate electronics". The sensors just output a yes or no, correct? -Adam On 11/15/06, Doug Coil wrote: > Cancer Research Project > ... - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Moving in southeast Michigan? Buy my house: http://ubasics.com/house/ Interested in electronics? Check out the projects at http://ubasics.com Building your own house? Check out http://ubasics.com/home/ -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist