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Here's a little pump that seems perfect for the purpose.

Smallish volume, periodic pulses, has a peristaltic pump section to fill it.

https://www.aliexpress.com/item/4000943927079.html

One source for a durable, inexpensive and Arduino compatible depth / linear sensor can be found in cars that have adjustable ride height. The Linear sensor used on fords and Lincolns, takes a 5v supply voltage and outputs a signal proportional to the length. It's waterproof, very reliable and it or ...

I'm not sure whether air pressure will yield usable data, but it might be worse to experiment with it... Generally, the suction is already enough to keep the cock inside in most cases. Only on full stroke-length, it sometimes slips out... A simple loose rope-harness does a great job of keeping the ...

Alternatively, you could connect a small stepper-motor to the arduino and use it to turn the power-level knob. There are also digital potentiometers. I think, internally they work very similar to your solution. I'm just not sure, if they can handle the voltage. I have seen them rated for up to 36V,...

Excellent work.

I can see lots of potential for extended teasing and torture.

An inflating plug but fill it with water instead of air?

Either use a syringe instead of the squeeze bulb or just submerge the bulb inlet in water and cycle until it is just water not air in it.

Dry mashed potato flakes mixed with powdered sugar, instant pudding powder and J-Lube turns into a slimy slippery mess when it gets wet and the potato flakes absorb a large quantity of fluid...

You will be operating in the 0- One great source for very robust and low cost pressure sensors is automotive applications. Pressure ranges vary but every sensor is package to be durable, robust, resistant to overvoltage, overpressure, chemicals and they are likely quite well calibrated compared to r...

One significant downside to DRM protected sexual content is that the act of validating your 'license' leaves a trail that could be followed to uncover the user of such content. At play time or possibly at install time to verify your license, the player will send your license code, player identifier,...

One method I have used although it was in a more urban area, is to tie a length of package string to each of the keys and a bit of branch or something else to the other end to make it a bit easier to find. Nothing flashy, just something to find in the dark. I then drove around and stashed the keys i...

sounds fun!

About to test it out... 11.jpg You can't see the string stretched in front betweeen the 2 cotter pins for me to release the leg weights once all the locks are closed and slack on arms taken up It worked very well a couple things to watch, if you dont let the weight reach the ground the chain will pu...

Locate holes so the rope has slack or release can be harder 6.jpg Make 2 or 3 longer loop then one very short loop with vertical holes for the release pin Here is a 25 pound weight hanging on it, release is easy, maybe a pound or 2 of pull on string Now for scenario setup: hang on hook and attach we...

I decided to build Sir cumference's rope and wood version. It worked well and can be made easily. Used 4mm paracord, 5mm drill bit and a piece of pine wood 1.jpg Note the cotter pin for a release. You could use anything smooth, I had these 2.jpg Support hole across board, 2 holes for each loop. 3.jp...

If you don't want to spend the money before you give it a try, here's a simple and as usual, nearly free method: You need: Rope At least one metal ring or eyebolt, 1" or so in diameter old athletic sock A small plastic baggie is optional. Medium to large ice cubes ( bigger than your eyebolt hol...