Now that the galvanometer has been repaired, what can I DIY with it?

littleshrimp

Now that the galvanometer has been repaired, what can I DIY with it? [Copy link]

 

I bought a galvanometer before. I took it apart and studied its principle briefly. I replaced the two burned resistors and left it there.

https://en.eeworld.com/bbs/thread-1081971-1-1.html

Today I soldered a single-ended to differential board and wrote a simple test program using NUCLEO-l452

After connecting, I tried it and it works fine.

I don't have a high-power laser or a field mirror. I don't know what I can DIY with this thing after it's repaired.

I started thinking about writing a program to import a picture and project it onto the wall, but it didn't seem to be of much use.

This is the effect of slow scanning

This is the effect of rapid scanning. The light spots on the X axis have been connected into a straight line.

maychang

“I don’t have a high-power laser or a field mirror.”

If you don't have a high-power laser, you can always have a laser pen, right? Laser pens are very cheap.

IC爬虫

DIY a laser radar, it is estimated that this can make dense point clouds

qwqwqw2088

Laser marking machine

chunyang

This is what is used in barcode scanners.

chunyang

If you want to do something practical and interesting DIY based on the galvanometer, you can consider projecting a clock, but you need two sets of galvanometers, or you can use a motor plus galvanometer. Put a wide hexagonal nut on the motor shaft, attach six reflectors to the outside of the nut, use it as a horizontal scan generator, and use the galvanometer as a vertical scan generator, with a red laser LED, the kind used by a laser pen, and then use an MCU to control the motor speed, the galvanometer movement, and the LED on and off, so that you can project a clock on the wall.

wsmysyn

I remember a previous project. The company had several laser marking machines. A colleague found a designer and then used the marking machine to print on his mobile phone.

The original purpose was to print the chip silk screen by myself.

littleshrimp

maychang published on 2019-10-17 09:49 “I don’t have a high-power laser or a field mirror.” If I don’t have a high-power laser, I must have a laser pen, right? Laser pens are very cheap.

Laser pens have low power and can only be used for projection, not “carving”

littleshrimp

IC Crawler published on 2019-10-17 09:55 DIY a laser radar, I guess this can make dense point clouds

I haven't tried whether the laser rangefinder will be affected by the reflection of the galvanometer. If I don't have a high-speed rangefinder and a laser radar with a galvanometer, it would be really good.

littleshrimp

chunyang posted on 2019-10-17 16:25 If you want to make some practical and interesting DIY based on the galvanometer, you can consider the projection clock, but you need two sets of galvanometers, or you can use the motor plus galvanometer solution. On the motor axis...

This is a dual-axis galvanometer projection clock. You can make it by getting a laser head and modifying the program.

littleshrimp

wsmysyn published on 2019-10-17 16:45 Recalling the previous project, the company had several laser marking machines. A colleague found a designer and then used the marking machine to print on the mobile phone...

There are many mobile phone engraving machines that seem to require high-power lasers.

wsmysyn

littleshrimp posted on 2019-10-17 17:06 There are many mobile phone engraving machines that seem to require high-power lasers

Well, the one the company bought before was used to screen print the chip. The power should be enough. If not, you can print it a few more times.

chunyang

littleshrimp posted on 2019-10-17 17:04 This is a dual-axis galvanometer projection clock. You can make it by getting a laser head and modifying the program

The dual-axis one is very simple. The projection clock at least has practical value. In addition to displaying the time, it can also display other simple information. Add voice control, and you're done...

chunyang

littleshrimp posted on 2019-10-17 17:03 I haven't tried whether the laser rangefinder will be affected by the reflection of the galvanometer. If I don't have a high-speed rangefinder and a galvanometer, it would be nice to make a laser radar.

The cost of making a scanning radar is not low...

littleshrimp

chunyang published on 2019-10-17 20:17 The dual-axis one is very simple. The projection clock at least has practical value. In addition to displaying the time, it can also display other simple information. Add voice control, and...

This thing consumes too much power. When running, the optical galvanometer is +-15V and 0.5A, and the noise is relatively large.

chunyang

littleshrimp posted on 2019-10-17 21:02 This thing consumes too much power. When running, the optical galvanometer is +-15V 0.5A and the noise is also relatively large

That's why you need to have a voice control to turn it on, and then set it to work at a certain time or shut it down with voice control, or use other controls, instead of having it work continuously for a long time.

littleshrimp

chunyang posted on 2019-10-18 14:18 That's why you need to turn it on with voice control, and then work on a timed basis or turn it off with voice control, or use other controls, it's not for long-term continuous operation.

I bought a low-power laser head and tried to draw an image. When testing it, I found that the swing speed of the Y axis is much slower than that of the X axis. I guess the motor and circuit bandwidth are relatively low.

chunyang

littleshrimp posted on 2019-10-19 16:27 I bought a low-power laser head and tried to draw an image. When testing it, I found that the swing speed of the Y axis is much slower than that of the X axis. I guess the motor and circuit bandwidth are...

That requires some calculation, and it cannot be achieved directly if it is below the residual limit of human eye vision.

天文望远镜

I have a question. According to the information, the swing angle is very small, within 40 degrees. So how can we achieve a swing of 100 degrees?

天文望远镜

Looking at your pictures, the scanning range is very small. How can you achieve a range of 5 meters?