===== wearable + mobile dev. ===== ==== current ProjectTxoom system. ==== (include notes from hw meeting on 20020806 + brief summary of design descisions/options/etc+ --[[nik gaffney]]) Work is continuing on a new wireless sensor aquisition system, to hopefully overcome the problems found with all the previous systems. The current version is still built on a series of comprimises between price,availability,elegance,wirelessness and flexibility, however it should be edging towards something better. **Hardware setup** * CerfBoard (strongARM) see: [[Cerf Notes]] * 3d acceleromter units * WCF12 802.11b compact flash card * sony info lithium battery + 5V regulator **Software setup** * i-Linux (instrinsyc's branch of familiar from http://www.handhelds.org ) * adxl drivers * calibration + sensing code (gpio -> [[OSC]] ) details can be found in the techspec (linked from [[Project Txoom System]] ), code is in cvs, and notes can be found in the [[Cerf Notes]] node. **datarates.** * sampling periodicity: ~10ms/vector or as close to 4ms/point as possible (100-250Hz) * latency: should be as low as possible. if a vector takes too long to store, send points. * thruput: accelerometer data is single byte (8bit) per point. calulations for 2x3d acceleromters (for reference) * 8bits x 6axis = 48bits/0.004s = 12kbps (at 4ms sampling rate) per player. * 8bits x 6axis = 48bits/0.01s = 4800bps (at 10ms sampling rate) per player. * 8bits x 6axis = 48bits/0.02s = 2400bps (at 20ms sampling rate) per player. (note: raw data, no correction, or stop bits) | players | 4ms | 10ms | 20ms | | 1 | 12k | 4800 | 2400 | | 2 | 24k | 9600 | 4800 | | 3 | 36k | 14.4k | 7200 | | 4 | 48k | 19.2k | 9600 | | 5 | 60k | 24k | 12k | {{sensor_monitor.png}} ==== setup + config notes for CERF/CEED based system ==== see also CerfNotes for more details wired connection * prerequisites * ceed * sensors + cables * network with DHCP server * power suppply or batteries * attach ethernet cable to the ceed box * powerup ceed * wait for a while, * find its ip * run nmap or similar to find which ip# it has ... * eg. # nmap -sP 192.168.254.1-15 * check which ips are in use before + after turning the ceed on * check there is something listening to port 5333 on the host machine (eg, 'oz', 'nc -lup 5333' or an OSC capable program) * connect to the ceed # ssh -lroot 10.0.0.x * load the adxl module # insmod adxl.o * run the sensor program in test mode # ./operate -c debug.conf -h * check which chanels are active * edit the operate.conf file if required. * run the sensor program # ./operate -h * sit back + relax wireless connection * make sure the base station is active * check SSID set to f0am (using ap-config under GNU/Linux) * contine as above from the 'powerup ceed' step ==== setup + config notes for IPaq based system ==== see also [[IPaq Notes]] for more details these notes are meant as a quick guide to setting up the ipaq + sensor sets for the tgarden/tx0om system(s). insprired by my lack of memory, and the fact that teh wearables can be fickle creatures, .. . so, * connect access point to network * turn on ipaq * press the "Q" button to boot linux * open 'Utilities -> Input Methods -> Xkbd' by clicking on the screen * open 'Root' window by clicking on the screen * (optional) type 'bash' for smoother shell interaction * type 'ifconfig' and see if there is an entry for 'wlan0' * type 'pump' and check ifconfig again. * if there is no entry for 'wlan0' device, type... ifconfig wlan0 192.168.254.3 netmask 255.255.255.0 up (substituting the suitable ip# and mask for the network) * check ifconfig again. try to ping a host (using ip#) * if there is no route to host, try typing... route add default gw 192.168.254.1 (or whatever the ip# of the access point is) * type 'route' and check the routing table is correct * dont bother with /etc/resolv.conf unless you must * it should now be possible to connect to the ipaq using ssh now, the sensors... * make sure the stamp is charged + sensors connected * on the ipaq, enter 'cat /dev/ttySA0' to display data comming in the serial port * connect the stamp to the ipaq serial port * sit back + watch the numbers,. .. * if there are no numbers, there is a problem (find it + continue) calibrating... * cd to 'sensors' directory of $HOME * calibrate -c & * check the min + max values for each sensor channel operating... * operate -h * sit back + relax see also: [[Mobile Computing]], [[Wearable Computing]], [[Sensor Technology]], [[Human Interface System]]