Security Cam Robot, This Droid Is Watching For You. Jazzy Power Chair Frame

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Here is the current look of this project, Super cool update, magpi magazine wants to feature this build with steps how it was done , !

By jstarne1 Nov 2017 — Last update Nov 2018

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jstarne1

USA

#121 Feb 2018

Sabertooth is on idle but powered on. The Robot is not moving for this initial test , I wanted to get some base numbers as most the time the Robot will watch and wait , it doesn’t run around continuously.

jstarne1

USA

#122 Feb 2018

Ok, Update on the runtime test, the robot was idle but all the equipment except the IR leds ( which consume 24 watts max) , motion and ultrasonic sensors. You can see the pictures of the starting voltage and the end voltage. Doing research I found 11.8 is considered dead for a 12 volt battery. or 23.6 when two batteries are together. I notived after 24 volts the rate of drop increased and was quicky down to 14 volts for the combined batteries. Still enough to power the robot , but bad for the overall life of the batteries! So in the future I am considering 24 volts " dead".

jstarne1

USA

#123 Feb 2018

I wanted to test the battery longetivy, My goal is 24 hours without human intervention. Here is the starting voltage. ( I later found out that my batteries were not full when I started)

25.2 apparently is not 100 percent full, maybe these batteries were being broken in.

Excellent news ! After 24 hours runtime I still have battery life left.

24.6 volts from the 25.2 starting voltage. That is an average of .025 volts drop per hour.

Here is a reference chart I am comparing to for the battery capacity, take in mind I am running 24 volts.

after about 32 hours I was at 24 volts even but I wanted to see if I could make it to an even 48 hours. I pulled the plug on the battery for recharge at 42 hours.

jstarne1

USA

#124 Feb 2018

I charged both batteries on two 3 amp chargers for 12 hours and now they read a higher combined voltage than before! So apparently when I started this test I was only at about 80-85 percent battery capacity.