| ??? 11/22/04 08:39 Read: times |
#81669 - Universal? Responding to: ???'s previous message |
I want to be able to measure the voltage in the battery then send that information back to a microprocessor. Well, that's just a matter of an Analogue-to-Digital (A/D) Converter, or "ADC" For an introduction to A/D converters, see the link here: http://www.8052.com/forum/read.phtml?id=81265 I want to be able to make it universale so that it can measure the voltage of any battery hooked up to it from 0V to 24V and I want to put it in system so it determines the voltage, not the user. Now that's more of a challenge! Useful measurements of a 1- or 2-cell NiHM (Nickel-Metal Hydride) battery would need to have a resolution on the order of 100mV (or less!)- but making this span up to 24V is non-trivial. When you say, "24V," do you mean literally 24.00V; or do you want to be able to connect to a "nominal" 24-V battery? eg, an automotive 24-V lead-acid batery could measure up to around 30V on-charge! how many volts are left in the battery How terminal voltage relates to remaining battery capacity is very heavily dependant on the particular battery technology; in may modern battery chemistries, it is not a good indication of the remaining battery capacity. Maxim, Texas Instruments, National Semiconductor, et al all have products for monitoring battery condition - you might like to check them out, and search their websites for application notes on the principles involved (I'm pretty sure Maxim has some useful stuff). |
| Topic | Author | Date |
| Detecting battery voltage | 01/01/70 00:00 | |
| Detecting battery voltage | 01/01/70 00:00 | |
| re: Detecting battery voltage | 01/01/70 00:00 | |
| Universal? | 01/01/70 00:00 | |
Better methods | 01/01/70 00:00 |