I too wish this project would get another update. If not, it would be great if we could get the schematic to edit/finalize. 

Hi Tyler. Is the project finished yet? I'm definitely interested In buying or building this device

Hi Tyler!

Thanks for doing this ! I wondering if you ever experienced lucid dreams on your own ?

Anyway I'll be the first to buy one of your clone when you'll get result ! I'm a super fan

Good luck

Hi!

I have had one lucid dream before but not when wearing the headset, however I still have only tested the headset twice and both times everything was still not working the best. I am almost done with the next prototype using the same board but a much better electrode and headband setup and will be updating the project soon. Thanks for your interest!

I've heard some conflicting information between the lucid dreaming using tACS vs tDCS, can you link me to a whitepaper? Also, any success with lucid dreaming yet?

Hi, here is a link to the paper I am referencing.

 http://www.nature.com/neuro/journal/v17/n6/full/nn.3719.html?WT.ec_id=NEURO-201406

Also no success yet I have only tried two nights, however I just got a new headset made that is much more comfortable to wear while sleeping. I plan on starting to work on the project much more starting next week when I get out of school.

Hey, thanks for putting effort into this. We really need a good open tACS device.

Why do you use a digital potentiometer and not an A/D converter? I find this to be the main problem of OpenStim because you can't get down to very low currents. But the components list tells me you chose a different approach. Maybe the schematics would answer my question already. Could you post or link these or maybe the github page?

Hey thanks for checking the project out! Here is a link to the pdf on the github page: https://github.com/breadboardbasics/Lucid/blob/master/RevA.pdf just click the "view raw" link to download the file. 

The digital pot allows me to contol the amount of current in software, and I did consider using PWM but I didn't want the actual PWM frequency in the output so it would have required some filtering circuitry which I didn't want to fool with.

If I were to redo the board I think that I would choose a slightly different approach for this. Hopefully the schematics help but yes you can get down to very low currents with this design. 

Ah, I see, separate oscillator. That makes sense. If I understand this correctly, you can't control the frequency in software. This would be a nice feature to have since different frequencies may have different effects and we are still at the very beginning of experimenting with this.

If you don't mind answering some more questions:

Did you measure the current with the scope, like with a µCurrent? How accurate would you say is it?

Did you test how well it reacts to sudden and strong changes in the resistance (electrodes getting out of place, heavy sweating).

What current do you use? Does it ramping? What's the highest current it can produce?

I'm asking more for the hardware here, I haven't looked into the code, yet.

And, a question not exactly related to the device: How high would you go with the current if you know it helped better? Like, if it would turn out that it would be perfectly reliable for LD induction at 3 mA or more. Would you do it?

OK, I looked at the code (that is simple, man). So I remove the question about ramping.

What other things to you plan to include?

Yep, you are right I can't control the frequency or wave type through software which is definitely a con of doing it with the oscillator. After testing with the current revision hardware I plan on creating a new revision that will use a DDS chip such as the AD9837 where I can set frequency through software. The reason I didn't use it to begin with is I simply didn't know about them haha.

The current is measured with my scope or multimeter, I don't own a uCurrent, but it should still be fairly accurate, my multimeter has a resolution of 10uA. Also the current should't be a very critical parameter as far as accuracy goes. 

I did not test it for sudden loads but that is something I should definitely do, thanks for the inquiry.

As far as you question about how high I would go with the current, I would not go very high. In my last test I only used .25mA and I could still slightly feel it. I tried it at around 1.5mA and I was getting those flashes in the eyes and could really feel my skin tingling under the electrodes (It is kind of scary haha).

Currently I am working on converting all the code to pure C and writing a script that will program the device easily, prompting for different parameters such as the time to wake up and current and then automatically programming the device. Before I had to manually go in and manually change the parameters in either Atmel Studio or Arduino and then upload it which is a hassle right before bed.

After the new code is done I am going to work more on the electrodes and headset to make it more comfortable and easier to sleep in.

Thanks!

Thanks for your detailed reply. I like what you have planned. I wish I could help somehow. My knowledge about electronics is still below yours it seems. But I'll definitely test the next revision.

Whether you use a DDS or generate the frequency directly in the Atmel, the crucial part is the current control. Using a DDS doesn't sound as flexible. And I don't think it would have to be a perfect sine wave. But I'm not trying to talk you into doing it my way.

How did you encode those images? I've never seen images that load like that before.

Hmm.. I know that I used some sort of online jpeg compressor because the original pictures were to big but other than that I'm not sure. Are they fast or something?

The load first in blurry black-and-white from top to bottom, and then the color loads from top to bottom.