Hello,
I built an electric motorcycle using 24 - 90 A-hr LiFePO4 batteries. I would like to build an individual battery monitor that would operate between 3.5V and 2.5V. I have already constructed a basic circuit using the LM3914 chip. I just followed the diagram in the spec sheet and built a 0-3.5V circuit with a 10 element LED. I understand how to calculate the Vref out but I need help with figuring out how to use the R lo (pin 4) to get a 2.5V - 3.5V monitor.
Could you help me understand how the R Low works and how to determine what resistance I need?
Right now I am using 2.18 Kohm for R2 and 1.21 k ohm for R1. 0 - 3.5 V works great. Need 2.5V - 3.5 V and would like to understand why.
Thanks
PS If you'd like to check out the bike it's at electrovoyageur.com
I built an electric motorcycle using 24 - 90 A-hr LiFePO4 batteries. I would like to build an individual battery monitor that would operate between 3.5V and 2.5V. I have already constructed a basic circuit using the LM3914 chip. I just followed the diagram in the spec sheet and built a 0-3.5V circuit with a 10 element LED. I understand how to calculate the Vref out but I need help with figuring out how to use the R lo (pin 4) to get a 2.5V - 3.5V monitor.
Could you help me understand how the R Low works and how to determine what resistance I need?
Right now I am using 2.18 Kohm for R2 and 1.21 k ohm for R1. 0 - 3.5 V works great. Need 2.5V - 3.5 V and would like to understand why.
Thanks
PS If you'd like to check out the bike it's at electrovoyageur.com
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