bicycleledpov - Project Hosting on Google Code

Older Oct 22, 2009 HardwareV1point1 (Describing updates in version 1.1.) Wiki page commented on by Julian800 - Holtek’s HT1632C LED driver can save you a lot parts. that also give you PWM contol of LED Holtek’s HT1632C LED driver can save you a lot parts. that also give you PWM contol of LED Aug 22, 2009 V2_prototype (Prototype V2.) Wiki page edited by casainho - Revision r374 Edited wiki page through web user interface. Revision r374 Edited wiki page through web user interface. Aug 22, 2009 V2_prototype (Prototype V2.) Wiki page edited by casainho - Revision r373 Edited wiki page through web user interface. Revision r373 Edited wiki page through web user interface. Aug 21, 2009 2 Wiki pages changed by casainho - Revision r372 Renamed AT91SAM7 to V2_prototype. Added V2_prototype Deleted AT91SAM7_prototype Revision r372 Renamed AT91SAM7 to V2_prototype. Added V2_prototype Deleted AT91SAM7_prototype Aug 17, 2009 r371 (I started working on a new version of hardware, the V2.0. It...) committed by casainho - I started working on a new version of hardware, the V2.0. It will have an ARM with USB instead an AVR USB, mainly because I need to have cheap, Open debug tools, not like on Atmel AVR which are proprietary and expensive. I started working on a new version of hardware, the V2.0. It will have an ARM with USB instead an AVR USB, mainly because I need to have cheap, Open debug tools, not like on Atmel AVR which are proprietary and expensive. Aug 17, 2009 r370 (Deleted V1.1 dir hardware since it will not happen.) committed by casainho - Deleted V1.1 dir hardware since it will not happen. Deleted V1.1 dir hardware since it will not happen. Jul 15, 2009 AT91SAM7_prototype (Prototype based on Atmel ARM7 AT91SAM7) Wiki page edited by casainho Jul 14, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 10, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 10, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page commented on by casainho - Well, a LDO would have that 0,4V drop or a bit less, so, I think the idea of this diode is good :-) -- but with the LDO, alkaline cells could also be used. I think is not safe to put the circuit not working with alkaline cells. [http://pt.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMuh5GEe0gqtiiXaqZ8L%252b3a%2f Here is one LDO] that costs 0,214 € at 1 unit and drop out voltage: 0.18 V @ 150 mA. Well, a LDO would have that 0,4V drop or a bit less, so, I think the idea of this diode is good :-) -- but with the LDO, alkaline cells could also be used. I think is not safe to put the circuit not working with alkaline cells. [http://pt.mouser.com/Search/ProductDetail.aspx?qs=sGAEpiMZZMuh5GEe0gqtiiXaqZ8L%252b3a%2f Here is one LDO] that costs 0,214 € at 1 unit and drop out voltage: 0.18 V @ 150 mA. Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page commented on by dziems - I don't think a Linear Low Drop Out voltage regulator is needed. Because both the ARM and the DataFlash are happy with a 3.6V input, and both can withstand up to 4.1V input if need be, just 3 NiMH batteries are sufficient to power everything. If you are really concerned that after a full charge, the NiMH batteries will exceed 4.1V, we can put a Schottky diode between the battery positive voltage and the Vcc of the ARM and DataFlash. This should drop the voltage by 0.4V, so if the batteries are inserted with, say, 1.5V per cell, the diode will drop the Vcc to 4.1, which is within spec, and that voltage will drop rapidly due to the nature of NiMH batteries. The diode has the added benefit of protecting the batteries. Because both the ARM and Dataflash are only rated down to 2.6V operation, having a 0.4V Schottky Diode will prevent the average cell voltage from going below 1.0V. Going below that is dangerous for NiMH and NiCd batteries. I don't think a Linear Low Drop Out voltage regulator is needed. Because both the ARM and the DataFlash are happy with a 3.6V input, and both can withstand up to 4.1V input if need be, just 3 NiMH batteries are sufficient to power everything. If you are really concerned that after a full charge, the NiMH batteries will exceed 4.1V, we can put a Schottky diode between the battery positive voltage and the Vcc of the ARM and DataFlash. This should drop the voltage by 0.4V, so if the batteries are inserted with, say, 1.5V per cell, the diode will drop the Vcc to 4.1, which is within spec, and that voltage will drop rapidly due to the nature of NiMH batteries. The diode has the added benefit of protecting the batteries. Because both the ARM and Dataflash are only rated down to 2.6V operation, having a 0.4V Schottky Diode will prevent the average cell voltage from going below 1.0V. Going below that is dangerous for NiMH and NiCd batteries. Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 09, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 08, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page edited by casainho Jul 07, 2009 AT91SAM7_prototype (One-sentence summary of this page.) Wiki page added by casainho Dec 14, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Dec 14, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Dec 06, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Dec 06, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Dec 06, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 12, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by casainho Nov 06, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by casainho Nov 05, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 05, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 04, 2008 r349 ("Command 1: Get identificacion string" updated on firmware.) committed by casainho - "Command 1: Get identificacion string" updated on firmware. "Command 1: Get identificacion string" updated on firmware. Nov 04, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition for interaction between HaRdware and SoFtware...) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 04, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by kvassoff Nov 03, 2008 r339 ("Command 1: Get identificacion string" is working. This is a...) committed by casainho - "Command 1: Get identificacion string" is working. This is after a new API rewrite. "Command 1: Get identificacion string" is working. This is after a new API rewrite. Oct 26, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by casainho Oct 26, 2008 BicycleLEDPOVAPI (API definition to interaction between HaRdware and SoFtware.) Wiki page edited by casainho Oct 21, 2008 r336 (Added the REPORT_COMMAND_UNIMPLEMENTED when a command is not...) committed by casainho - Added the REPORT_COMMAND_UNIMPLEMENTED when a command is not implemented :-) Added the REPORT_COMMAND_UNIMPLEMENTED when a command is not implemented :-) Oct 21, 2008 r335 (Implemented sequencial reading and writing on firmware API.) committed by casainho - Implemented sequencial reading and writing on firmware API. Implemented sequencial reading and writing on firmware API. Oct 18, 2008 r334 (API is implemented and tested.) committed by casainho - API is implemented and tested. API is implemented and tested. Oct 18, 2008 NeWs Wiki page edited by casainho Oct 18, 2008 NeWs Wiki page edited by casainho Oct 18, 2008 r331 (Commited some changes on BicycleLEDPOV.c and .h files. Added...) committed by casainho - Commited some changes on BicycleLEDPOV.c and .h files. Added minipov directory where there is code that do a minipov, writing "1 2 3" on LEDs -- also added one picture on dark room showing that message :-) Commited some changes on BicycleLEDPOV.c and .h files. Added minipov directory where there is code that do a minipov, writing "1 2 3" on LEDs -- also added one picture on dark room showing that message :-) Oct 16, 2008 NeWs Wiki page edited by casainho Oct 15, 2008 r329 (Since I coudn't make DataFlash memory working, I changed it ...) committed by casainho - Since I coudn't make DataFlash memory working, I changed it for an EEPROM. I wrote and tested EEPROM drivers. I am also commiting lastest version of drivers for DataFlash because I hope in future be able to put it working. Since I coudn't make DataFlash memory working, I changed it for an EEPROM. I wrote and tested EEPROM drivers. I am also commiting lastest version of drivers for DataFlash because I hope in future be able to put it working. Oct 02, 2008 NeWs Wiki page edited by casainho

AT91SAM7_prototype (One-sentence summary of this page.) Wiki page commented on by dziems - I don't think a Linear Low Drop Out voltage regulator is needed. Because both the ARM and the DataFlash are happy with a 3.6V input, and both can withstand up to 4.1V input if need be, just 3 NiMH batteries are sufficient to power everything. If you are really concerned that after a full charge, the NiMH batteries will exceed 4.1V, we can put a Schottky diode between the battery positive voltage and the Vcc of the ARM and DataFlash. This should drop the voltage by 0.4V, so if the batteries are inserted with, say, 1.5V per cell, the diode will drop the Vcc to 4.1, which is within spec, and that voltage will drop rapidly due to the nature of NiMH batteries. The diode has the added benefit of protecting the batteries. Because both the ARM and Dataflash are only rated down to 2.6V operation, having a 0.4V Schottky Diode will prevent the average cell voltage from going below 1.0V. Going below that is dangerous for NiMH and NiCd batteries.

I don't think a Linear Low Drop Out voltage regulator is needed. Because both the ARM and the DataFlash are happy with a 3.6V input, and both can withstand up to 4.1V input if need be, just 3 NiMH batteries are sufficient to power everything. If you are really concerned that after a full charge, the NiMH batteries will exceed 4.1V, we can put a Schottky diode between the battery positive voltage and the Vcc of the ARM and DataFlash. This should drop the voltage by 0.4V, so if the batteries are inserted with, say, 1.5V per cell, the diode will drop the Vcc to 4.1, which is within spec, and that voltage will drop rapidly due to the nature of NiMH batteries. The diode has the added benefit of protecting the batteries. Because both the ARM and Dataflash are only rated down to 2.6V operation, having a 0.4V Schottky Diode will prevent the average cell voltage from going below 1.0V. Going below that is dangerous for NiMH and NiCd batteries.

Older