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hw_how_to_-_faq [2018/07/11 08:25] (current)
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 +====== Hardware How to and FAQ ======
 + This page discusses many of the common '//how to'// questions related to WISP hardware\\ ​ Questions? - [[http://​www.wikispaces.com/​user/​view/​alanson|{{http://​www.wikispaces.com/​user/​pic/​alanson-lg.jpg?​16x16|alanson}}]] [[http://​www.wikispaces.com/​user/​view/​alanson|alanson]] and - [[http://​www.wikispaces.com/​user/​view/​yeagerd|{{http://​www.wikispaces.com/​user/​pic/​yeagerd-lg.jpg?​16x16|yeagerd}}]] [[http://​www.wikispaces.com/​user/​view/​yeagerd|yeagerd]] maintains this page.\\ \\ 
 +===== First Things First =====
 + If you are going to do anything with the WISP hardware you need to familiarize yourself with the schematics and layout.\\ {{ :​wisp4.1dl_annotated_pcb.pdf|WISP4.1DL_Annotated_PCB.pdf}}\\ {{ :​wisp4.1dl_schematic.pdf|WISP4.1DL_Schematic.pdf}}\\ \\  Next familiarize yourself with the general operation of the WISP\\ {{ :​design_of_an_rfid-based_battery-free_programmable_sensing_platform.pdf|Design of an RFID-Based Battery-Free Programmable Sensing Platform.pdf}}\\ \\ 
 +===== Debugging Tutorials =====
 + For hardware issues, see [[debugging_wisp_hardware|Debugging Hardware]].\\ ​ For firmware issues, see [[debugging_wisp_firmware|Debugging Firmware]].\\ ​ For RF Front End issues, see [[wisp_measurement_procedures|WISP RF FE Measurement Procedures]].\\ \\ 
 +===== General Questions =====
 +//& Discussion Board Archives//​\\ \\ **USB Debugger Power vs. WISP Power**\\ ​ see: http://​wisp.wikispaces.com/​message/​view/​home/​11538397\\ \\ **Oscilloscope Recommendation**\\ ​ see: http://​wisp.wikispaces.com/​message/​view/​home/​12966113\\ \\ **Is the Regulator Required?​**\\ ​ see: http://​wisp.wikispaces.com/​message/​view/​home/​12307113\\ \\ **The MSP430 Input Pins are Sinking Current**\\ ​ see: http://​wisp.wikispaces.com/​message/​view/​home/​11002101\\ \\ **Where is the EEPROM Code?​**\\ ​ see: [[eeprom|EEPROM]]\\ \\ **Troubleshooting the USB Debugger**\\ ​ see: http://​wisp.wikispaces.com/​message/​view/​home/​12772269\\ \\ **Measure / Test the RF Front End**\\ ​ see: http://​wisp.wikispaces.com/​WISP+Measurement+Procedures\\ \\ 
 +===== Probing and Measuring the WISP =====
 +\\ **How to measure rectified voltage**\\ ​ The rectified voltage can be measured on the Vout pin. See schematic and layout documents. [[wisp_4.1_dl|Wisp 4.1 DL]]\\ \\ \\ 
 +===== Hardware Modifications =====
 +\\ **Adding a sensor**\\ ​ The [[using_wisp_hw|WISP Hardware Features]] page has a section on unused pins for external sensors. There is also a tutorial on [[adding_a_new_sensor|Adding A New Sensor]].\\ \\ **Adding a super capacitor**\\ ​ WISP doesn'​t ship with a supercap by default. Its easy to install - just solder a large electrolytic,​ tantalum or super capacitor into the two big thru-holes on the WISP.\\ \\ 
  
 +| {{::​purplewisp_with_cap.jpg?​nolink&​472}} |
 +| Example of a 0.1F super capacitor installed on the WISP4.0 |
 +
 +| {{::​wisp_4.1_supercap_mounting_holes.jpg?​nolink&​689}} |
 +| The WISP4.1 has been designed to receive a Kanthal 0.1F super capacitor. The two large through holes (lighted in red) are connected to gnd and the Vout through a 100ohm resistor, please review the schematics and layout for details. |
 +\\ \\ //If you want to do it yourself (the fastest way)://​\\ ​ Make sure the cap you order can handle at least 6V and make sure to get the polarity correct. Some parts links:​\\ ​
 +
 + 
 +  * Electrolytic Cap
 +   
 +  * Somewhat bulky, lower density but relatively low leakage and low cost
 +   
 +  * Example 300uF: http://​search.digikey.com/​scripts/​DkSearch/​dksus.dll?​Detail&​name=P959-ND
 + 
 +  * Tantalum Cap
 +   
 +  * These have good density but high leakage (50uA to 150uA).
 +   
 +  * We've used this 1000uF part: http://​search.digikey.com/​scripts/​DkSearch/​dksus.dll?​Detail&​name=718-1006-1-ND
 +   
 +  * However, they have newer 1000uF offerings such as: http://​search.digikey.com/​scripts/​DkSearch/​dksus.dll?​Detail&​name=718-1619-1-ND
 +   
 +  * And higher density / higher leakage 2200uF such as: http://​search.digikey.com/​scripts/​DkSearch/​dksus.dll?​Detail&​name=718-1403-1-ND
 + 
 +  * Super Cap
 +   
 +  * 0.1F Kanthal MaxCap LX Series ([[http://​www.globar.com/​ec/​maxcap-double-layer-capacitors.html|Manufacturer Site]]) - Have to order direct. We have a bunch, and we'd be happy to send you some.
 +\\ //If you aren't comfortable soldering://​\\ ​ Send a message to - [[http://​www.wikispaces.com/​user/​view/​yeagerd|{{http://​www.wikispaces.com/​user/​pic/​yeagerd-lg.jpg?​16x16|yeagerd}}]] [[http://​www.wikispaces.com/​user/​view/​yeagerd|yeagerd]] and we can make arrangements to modify your hardware.\\ \\ \\ \\
 +----
 +\\  The last modification was made by - [[http://​www.wikispaces.com/​user/​view/​yeagerd|{{http://​www.wikispaces.com/​user/​pic/​yeagerd-lg.jpg?​16x16|yeagerd}}]] [[http://​www.wikispaces.com/​user/​view/​yeagerd|yeagerd]] on Apr 26, 2012 9:28 am
hw_how_to_-_faq.txt ยท Last modified: 2018/07/11 08:25 (external edit)