Good antenna requirements have been fulfilled by using a 3D antenna with a matching circuit between the RF unit of the MCU and the antenna itself. The underlying transfer function has been calculated by using some electrical circuits theorems. The enforced hardware bandwidth (~ 500Hz) could be read from the bode diagramm below. Enforcing a good noise rejection (high frequencies) by enabling the sensing of cranking sequences at the same time, ends up in the design of some hardware filtering stages. I designed and developped a four layer PCB accordingly to achievable requirements. I divide the whole system into the hardware (PCB, mechanical enclosure. I processed and refined those requirements and iteratively generated a list of achievable requirements. Enhanced antenna capabilities (sending/receiving).Compliance with some standard automotive protection requirements (Overvoltage, overtemprature.Detection of unwanted battery replacement events.Detection and classification of non negligible mechanical vibration related to the battery.Detection and classification of transients (cranking voltage.Voltage sensing for 12V / 24V car batteries.There were some major requirements when developping the BMM Measuring down to 0V is possible due to the integrated auxiliary supply. The BMM could also be used for sensing other system with DC voltage between 0 and 30V. The idea arose from a problem that arose in the past. I have been working on a car battery monitoring system for low budget applications. I am William Meli, a control system engineer living in the north of germany.
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