| Archive for TomboT www.tombot.net Beam robotics @ liverpool university |
| Pat |
IR mini sumo opticalhello tomjust two questions for shematic mini sumo optical edge sensor the valeur resistor is 90 and 60 ohm ?? when reference for IR composants , emetting and recepting... thank tom Patrick ( french-beamer ) |
| TomboT ! |
Sorry Pat, I was away for a few days....
The values of 90 and 60 ohms were derived for the paired IR devices from Maplin: http://www.maplin.co.uk/module.as...0&ModuleNo=10379&doy=12m4 Looking at the datasheet it says the maximum IF (forward current) value, so I tried to get it close to this. I will upload a newer IR circuit soon... I have been using a better version from the Solarbotics Sumovore. If you download the PDF for their sumo, you can use a 74hc240 for line detection. |