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New design for higher battery density…

I have realized that lead acid battery is way too heavy for Alfred’s body. However, I have to make a comparison and find a better way to have high density battery. Also price is another concern.

I have made some tests and concluded the battery comparison chart below:

Wh/kg Wh/l Wh/$
Lead Acid 33,4 97 3,6
NİMH 101 400 0,72
Lipo 161 385 0,9
Li-Ion 212 551 1,38

3S4P Li-Ion battery set will need to be regulated to 5 volts. I also created below diagram to reduce the voltage from 12 V to 5 volts.

 

 

 

I think this power system will support the Alfred’s RPI systems. Next step is to design the battery charge / discharge module for Li-Ion. In a way back to square one from charger perspective.

Alfred’s Power station to charge batteries from an old pc power supply unit

I was thinking of, how to charge batteries of Alfred. Suddenly I have realized that my old and probably dead computers psu can help me. If you think it supplies constant 12 volt for long long time. Maybe i can tune it make it work for Alfred for some time also. These batteries have 6 cells, each are 2.2 volt meaning fully charged battery will be around 13.2 volt. So I may need to modify the power supply a bit.

 

 

 

 

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1st hand initial moves

Finally very 1 st hand has the initial moves. You can’t imagine how it makes me happy when everything goes alright! Please click more to see it in action…

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Finally, I have my very 1st hand!

Finally, the hand that I have ordered has arrived. This will be my first hand. If you are having an IOT project then you should have mobility besides being extensible. Anyway, this is a good start for having a platform in Europe and managing some robotic system in America or APAC. Let’s see what we I can do with this. I will keep you posted!

Entry to Virtual Reality

Finally, I have written an android application that sends sensor data to pan/tilt camera system and camera moves with moving the phone. The camera sends the view to phone. So if you just plug in the phone to a Google Virtual Cardboard or any other android supported virtual reality headset it will just show you what the robot  sees. Video goes over fully TCP/IP to support IOT functions. Please click read more for detailed video…

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Bluetooth Client – Server

They say, when you have a client-server application written in same language it is easier to make talk two different application written in different languages. Well said, I don’t disagree. However, having some support on developing android can be beneficial. I am developing an application on MIT APP Inventor 2 with support of Taifun‘s java coding from Pura Vida Apps.

You should visit his page really great stuff.

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Alfred V3 – Chassis with 2nd Design completed

Finally building the chassis for Alfred V3 completed.

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Alfred V3 -2nd Design

Finally back from CAD Design. What I can say is this design is more stable, more IOT but more heavy. Hopefully, I will not face the weight issue that I have faced with V1. Luckily, I have 4 motors instead of 2. We will see.

Alfred V3 – Initial Failure

I have started to build V3. I have realized that the aluminium chassis is 10 cm. shorter than expected. Ica not place the middle wheels.  I should go back and start to work on CAD to build a new chassis design. Hmm!! Maybe it is a better idea to build a larger chassis. Let me think…

Alfred V3 – Started building

everything seems quite alright from the chassis perspective. Hope to finish building it this weekend.