http://jcehle.com/blog daily 0.75 2013-10-29 http://jcehle.com/index daily 1.0 2014-05-16 https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1377979842637-2HWK3NM0AFO33MJU1WUK/00_crystal_1.jpg WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1377980433706-JWSIE4T3FCXG4FN8SWFV/Screen+Shot+2013-08-31+at+1.17.44+PM.png WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1377982022095-KSRHKHOBXELYBTXGEOAG/cover.jpg WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1378791418601-BF3SNY2X2WBBQIDFV8JH/who_cover.JPG WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1378876754061-A9P9OZJBE4NJZIX739PI/00_cover.jpg WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1378945697958-WSVR6DBFV339QPS8RZBO/cover1.png WORK https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1400201989271-2UJ30DILOJSJAEUVKHA8/image-asset.jpeg WORK - 2014 Nissan Innovation Experience http://jcehle.com/bees daily 0.75 2013-10-17 http://jcehle.com/bees/2013/10/16/sensing-weight-with-raspberry-pi monthly 0.5 2013-10-17 https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1381972694156-DVRDEAJ6J5XGYHLL39AG/circuit_01.jpg BEES - Sensing weight with Raspberry Pi The weight-sensing circuit. Pictured is the Pi cobbler, the op-amp, and the A/D converter.  https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1381972907901-HQ69W80UTV6NJVTCU9RL/scale_01.jpg BEES - Sensing weight with Raspberry Pi The weight is placed on the sensor on top of an analog scale. We can see the current load on the sensor is about 9 lbs.  https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1381973044956-5VNVSUMICQLNZZ3GNV4M/reading_01.jpg BEES - Sensing weight with Raspberry Pi Highlighted in yellow we can see the Pi calculates the current load at 8.7 lbs - very close to the analog scale reading https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1381971049144-E5ZMG31858I83R01RGX4/sensor_01.jpg BEES - Sensing weight with Raspberry Pi The load sensor I am testing next to a US Quarter and a Limey 10 p coin for scale reference. Weight is calculated by placing a load on the plate and measuring the change in resistance. http://jcehle.com/bees/2013/9/19/bee-status-audio-sorted-start-on-weight monthly 0.5 2013-09-21 https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379629729927-ABGCX7VSMOJCEANCZOU9/mic.jpg BEES - Bee box - audio analysis + wieght sensing https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379791442134-11L0CNM0MXTKCTHG56CY/circuit_w_a-d.jpg BEES - Bee box - audio analysis + wieght sensing Now the circuit has the A/D converter integrated... need to take output from this back into Pi https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379791261785-D4OMD4A3U582OBGOXZ5B/circuit_op_amp.jpg BEES - Bee box - audio analysis + wieght sensing Circuit w/ op-amp measuring analog voltage difference on weight sensor https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379707962786-OQHO34GF74NKDMRR47WS/tone-generator.jpg BEES - Bee box - audio analysis + wieght sensing https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379783161283-C8S5C88JTVDBQNYXRT5T/avg_freq.jpg BEES - Bee box - audio analysis + wieght sensing A recorded 1218Hz sample is detected to be: 1217.92988804 Hz (highlighted yellow) - very accurate! https://images.squarespace-cdn.com/content/v1/521e9cc4e4b0d24e50084a37/1379791343567-Z0WW4422XNH6GOCA08YS/calibrate_analog.jpg BEES - Bee box - audio analysis + wieght sensing Circuit with weight sensor on scale to record reference points of analog voltage http://jcehle.com/bees/category/raspberry+pi monthly 0.5 http://jcehle.com/bees/tag/weight monthly 0.5 http://jcehle.com/bees/tag/GPIO monthly 0.5 http://jcehle.com/bees/tag/raspberry+pi monthly 0.5 http://jcehle.com/contact daily 0.75 2013-09-14