## Monday, January 25, 2016

### My next Robot - the biggest Dinosaur yet.

I am making a servo based tyrannosaurus modeled after my wooden version.  Here is a picture of the two of them side by side.  The biggest disappointment is his head.

Well that problem is solved.  Now to make him longer and taller....

He just keeps growing, but I am not sure the leg servos can lift this much weight?

Here he is in his first video. Yes the servos can lift his weight.

Here is how to control over 20 servos with an Arduino uno.  The tail can have two servos attached to each servo output with this two way splitter adapter.

## Wednesday, January 6, 2016

### Arduino Uno Powered 13/15/17 DOF Humanoid robot revisited

I had problems with weak servos on my 13-17 DOF humanoid robots.  So I am rebuilding them with better servos (MG-958's) and with better software.  They also have "heads" now!  Here is what the new 13 DOF robot looks like.
Here is the video on YouTube:

Next up is the 17 DOF humanoid robot.  This is what he looks like.

Here is his video on YouTube:

This next picture shows the back view.

Here is the array for walking forward:
int walkf[8][10] = {
// 0    1    2    3    4    5    6    7    8    9
{ 95, 105, 105, 105, 105,  95,  90,  90,  85,  85}, // Left Ankle
{ 90,  90,  90,  85,  80,  75,  70,  70,  75,  80}, // Knee
{ 90,  90,  90,  85,  80,  75,  70,  70,  75,  80}, // Hip
{ 95, 100, 100, 100, 100,  95,  90,  90,  85,  90}, // Hip
{ 95, 105, 105, 105, 105,  95,  90,  90,  85,  90}, // Right Ankle
{ 90,  90,  90,  85,  80,  75,  70,  70,  75,  80}, // Knee
{ 90,  90,  90,  85,  80,  75,  70,  70,  75,  80}, // Hip
{ 95, 100, 100, 100, 100,  95,  90,  90,  85,  90}, // Hip
};

This is the code to execute that array:
case 'f': // forward key
for (int i=0; i<10 i="" o:p="">
servo1.write(walkf[0][i]);
servo2.write(walkf[1][i]);
servo3.write(walkf[2][i]);
servo4.write(walkf[3][i]);
servo5.write(walkf[4][i]);
servo6.write(walkf[5][i]);
servo7.write(walkf[6][i]);
servo8.write(walkf[7][i]);
delay(twait);
}
break;

I have also added some more commands as seen in this video.

## Saturday, January 2, 2016

### Dell 2300MP repairs part 3 - Replacing capacitors in the power supply

I spent some time fixing Dell 2300MP projectors for Africa once again. As usual I replaced the 22 uF at 50 volt capacitors (see previous posts).  This time I also replaced another capacitor.  The new capacitor is rated at 1500 uF at 16 volts.  Here is a picture showing the new capacitor to change.  The capacitor is oozing goo so the problem is rather obvious!

Here is a pile of Dell 2300MP power supplies to try to fix.  I needed to fix four power supplies for the current pile of projectors.

Here is the pile of projectors, I managed to fix three of them.  I only had two bulbs so that is more than what I have all of the parts for.  I still have three projectors that are parts piles.