A recent project required an inexpensive microprocessor that could be battery operated and indicate if the batteries were low. I chose Microchip's PIC16LF84A for the microprocessor because it was simple to program and could operate between 2.0 and 5.5 V dc.

However, the PIC16LF84A doesn't have analog or comparator inputs. To meet the design criteria for a battery monitor, I went with Microchip's inexpensive MCP100315 Microcontroller Supervisory Circuit. It costs $0.33 each in small quantities.

In the circuit, U1 is the PIC16LF84A microprocessor. R1 and D1 make up the low-battery indicator circuit. R2 is a 10-k Ω pullup resistor for the MCLR pin. X1 is a low-power 32.768-kHz oscillator. C1 and C2?68-pF capacitors?were needed so that the oscillator would operate properly.

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Reader Comments I just want to know, which are the steps that i need to follow to start any design? Raul Rosas -February 06, 2007 Hello!!! what is the purpose of this design and where is it used, with regards to the benefits provided by this project???? jerry -September 22, 2006   (Article Rating: ) Good morning sir sir i need some of good projects related to electronics,it may be an wireless or processor based ,please i need it for my project work for exams of this sem ,as fast as you can. thanking you KIRAN,MEI POLYTECHNIC -August 26, 2006   (Article Rating: ) please i want to know howto build an inverter Akintunde sunday -July 29, 2006 PLEASE I WANT TO KNOW HOW TO BUILD AN INVERTER chuksmas ekwunife -January 31, 2006 PLEASE, I WANT KNOW HOW TO BUILD AN INVERTER chuksmas ekwunife -January 31, 2006
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