Build an Organ Pipe Doorbell (Part 1), DIY, with Raspberry Pi

I'm an organist and an electrical engineer. I've always loved the pipe organ and even got my first few pipes at age 10 from Moller Pipe Organ Company (now out of business). I recently purchased a full 8ft Gedeckt rank from Taylor Miller Organ Co (York, PA), who has a huge stock of random organ parts. I decided I wanted to make a doorbell for my house using a portion of the pipes. Concept: 1. A passive infrared sensor outside the front door senses when a person is within 1-2 yards of the door and turns on a small blower in the basement. 2. The air then pressurizes a windchest in the entryway. 3. When the person presses the doorbell, the organ pipes play a random jingle for 2-4 seconds. -- The songs would be stored on a tiny computer (Raspberry Pi) and would change depending on the season. For example, Bach's Toccata in D minor for Halloween, Christmas songs for December, Happy Birthday on the birthday of one of the people living in the house, maybe even hymns on Sunday, etc. ==== PARTS LIST ==== Pipes, small regulator (probably not necessary): -- Taylor Miller Organ Co, York, PA -- Pipes: $400, 8' Moller Gedeckt rank, runs great at 1.5-2" wind. -- Regulator: $50, with two leaf springs (only need one at low pressure). Blower: -- Nidec 24v, 0.53A, model E1331K24B9AZ-00 Valves: -- Kimber-Allen direct-action valves: ~$3 each from Ebay. Never touch the chromed plunger; it'll corrode and lock up! Other direct-action valves will work, such as Wicks, Petersen, etc. MOSFETs: IRF540N with 5v logic. Choose a more modern one with lower Gate threshold voltage for use with 3.3V logic. Computer: Raspberry Pi3 with IO Pi Plus hat (32 I/O logic channels at 5v output for logic High). IO Pi Plus 2.1 hat for Raspberry Pi3: -- [IO Pi, UK] https://www.abelectronics.co.uk/p/54/... -- [IO Pi, USA] https://www.robotshop.com/en/32-chann... -- [Code] https://github.com/abelectronicsuk/AB... PIR sensor: Panasonic EKMC2693111K Three pins: +5v, GND, and Analog Out. After 30s warm-up delay, the Output is typically at 1.1v with 80-100mVp-p noise. A detection event appears as a sinewave blip with peak above 1.9v and trough under 0.2v. Doorbell button: ?? Haven't done this yet. ====== Please subscribe for more!!!