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Everything posted by Gm7dha

  1. Your buzz I would imagine is 'normal' as it's a SMPS... Probably cheap components and not particularly well filtered for EMI/RFI either.
  2. Thanks. I've recently had a struggle finding the correct fittings for the hose between the OPV and brew boiler. I need to install in the flowmeter between these two points, anyway, fittings are coming, hopefully they're the correct ones and I get get cracking on. My minimal knowledge of Arduino/C++ led me to believe I'd possibly need more than one Arduino, however, having researched Finite State Machines, I should be able to keep it all in one Arduino. Code is about 70% complete at the moment. Also, my V1/V2 steam arm decided to give up. I wasn't too confident with it anyway, trying to weld two dissimilar metals was never going to go well. Anyway, installed a V3 steam arm no problem. Will hopefully have more photos and progression up soon!
  3. Well I managed to extract a drinkable Espresso yesterday with a simple switch to start/stop the process... Just to make sure it worked ok. I did have to switch out the 10A relay for one of the 2A relays to trigger the pump. The 10A wouldn't latch for some reason. I tried another 10A and a 40A with no joy... Possibly something to do with holding currents or something? The pump only draws 200mA or so. Anyway, I can foresee an issue with the flowmeter as it uses interrupts. I can use it within a 'while' loop but this means the PID will run away with itself for 30secs or so which is not good (unless I'm missing something as I've never used Arduino before). I decided to buy 3 Nano's, 1x for PID, 1x Flowmeter, and the last one to swap out for the Mega eventually. My understanding is you can have Arduino's communicate with each other, this means the PID's and Flowmeter can continuously run without interruption and interrupting the main code/loop. Perhaps a Raspberry Pi would have been a slightly better option but I believe they don't have TTL And would require bi-directional shift registers - all a bit too much for me at the moment! On other news, I'm having to look into 1/8" BSP female fitting with either push-in or hose barbs to connect the flowmeter in-line. Also, my 'welded' steam wand decided to give up so I've ordered a Silvia V3 as it looks like it should just pop on! Will keep the updates coming.
  4. Congrats! Hope the Niche fits in nicely!
  5. Well it was project day today and made good progress. Most of the top-end is built up proper. The bottom end is temporarily set up for testing before I mount a metal enclosure underneath to house most of the electronics. A few more wires to plug into the Arduino and I can start testing. No menu's or "operations" set up yet in code - that'll take the most time of all in this project I think. Anyway... getting on with it nicely!
  6. Some 40A relays for my project... Ordered too many by mistake! Doh! https://drive.google.com/file/d/1DSedghBjRne2i0ykhkBS-s-UDlQ1RIak/view?usp=drivesdk
  7. Ultrasonic water level sensor working and semi-calibrated to deliver water level percentage. The position of the sensor is roughly where it will sit once installed. I tried it here to make sure there would be no erroneous readings from wall reflections etc. You'll notice the reading fluctuates a lot when pouring the water in, this will be due to the ripples/movement - when the machine is in operation the water won't move quite so "violently" so will be fine. I require a cone-bit drill bit to drill the two holes in the casing for the TX/RX modules, should arrive tomorrow and can hopefully be fully trialled in it's proper state then.
  8. Made a prototype box for the OLED's today just to double check sizes and fitment etc. Needs a few adjustments but not too far out. Being where the displays are, I wanted them boxed and sealed to keep moisture out.
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  10. I may indeed upgrade for all they cost! I would have just taken them as face value. Thanks, MrShades. Saves me any future hassle. The boilers only draw 5.6A max I believe, but best to err on the safe side. The reason I'm PID'ing the steam boiler is so I can have it idle at a lower temperature, thus, saving the seals etc and it means I can get it up to steam temp in no time rather than waiting if it was a mere on/off switching affair. Flowmeter operational:
  11. Got the PID code working for both RTD's/SSR's (Boilers), will need tuning once the machine is back together and running. Received my volumetric flowmeter today so I shall try get that up and running this weekend.
  12. Yeah i think the big problem with the steam boiler is that people would leave the unit powered on for a long time and also not refilling the boiler after steaming. To hopefully resolve the steam boiler issues I'm going to implement an auto-refill feature and also have the PID reduce the temperature to around 95°C after the machine has been sitting idle for more than 5 minutes. I'll be replacing the oring that seals the top/bottom parts of the boiler with a silicone one as well. I could use a 25A SSR and have the whole machine shut-off after say 30 minutes, or, just shut-off both boilers with existing SSR's I don't think I'll have much problem with the steam boiler taking all that into account.
  13. I thought I had a reference to KitchenAid in the title, seems I never, so yes, a bit misleading! I do apologise! Changed it now (hopefully it updates properly). I've got 2x new seal kits with the Silicone o-rings for the boilers. Hopefully that'll be better for the steam boiler. The steam boiler was leaking a bit but not badly, caught it before any damage was done to the castings/paint thankfully. Received my 4x SSR board today, 1x to control the pump, 1x to control the boiler 3-way solenoid, and 1x to control the steam boiler 2-way solenoid... leaves one spare for something else if anything happens to crop up. Also ordered an ultrasonic detector. Hopefully I'll be able to measure the water level in the water tank without any problems/spurious reflections from the tank walls throwing the readings off. If it works I'll have a percentage bar showing water level and a safety "lock-out" feature if water depletes to a certain level.
  14. All Gaggia made parts, even down to the castings. The poor reliability is due to the targeted market's lack of knowledge on how to properly use the machines; exception being the poor switch gear and overall execution of the assembly! Shame really. Looking forward to turning it into the machine it should have been
  15. 2x PT100 RTD's up and running tonight showing temps on both displays. Just a trial, this is not how they will look once complete.
  16. 2x PT100 Temp Sensors for my Dual Boiler KitchenAid/Gaggia Arduino Project https://drive.google.com/open?id=1-hkkxuW5ghNLMyZmGcuZO9ZP7p8IBijQ
  17. Just starting to get things moving. Boilers etc all cleaned. Internal framework gritblasted ready for painting. Starting to see Arduino parts arrive and got the two displays working tonight:
  18. I recently found that the KitchenAid Artisan espresso machines used mainly Gaggia Classic parts inside and that they were dual boiler so I managed to pick one up from Ebay at £41 in a nice fetching "Medallion Silver" finish. It would be a great starting point for a project. I did have in mind re-casing the whole project but the KA casing is in fantastic condition and does look a lot better on the counter-top that it does in photographs. Anyway, It all worked absolutely fine on testing and produced a decent espresso. The steam boiler I could hear a slight hiss from and upon inspection noticed a little weeping between the top/bottom boiler sections. The plan is to completely strip, clean, re-seal and rebuild the boilers, 3 way solenoids, OPV etc. Clean up the casing and framework. Add all the Arduino gubbins. Features/Mods: 1. I've already modified a V1/V2 Silvia wand by cutting and welding the "ball joint" section from the old wand onto the Silvia wand - So now it articulates! 2. Arduino controlled PID's with PT100 sensors and SSR's. I'll program the steam boiler to go into Idle mode after 5 mins of no activity and reduce temp to save the seals. 3. An SSR to PWM the pump so I can add pre-infusion and possible pressure profiling at a later date. 4. Volumetric flowmeter so I can switch between volumetric shots, time-based, or manual 5. Possibly add pressure sensors for boiler pressures (and brewhead pressure if I can figure out how) 6. Will add other features like On/off for service boiler, descale/backflush programs, steam boiler auto-refill etc 7. Remove the two useless temp gauges and replace them with OLED displays 8. Original switch gear will be replaced, possibly a d-pad/joystick type for scrolling through menus Photos of the machine in it's various stages of disassembly below: https://drive.google.com/open?id=1B3v_CZkXpclEsZ6LjCiI0q16ndA4oxRd Any ideas of features that I've missed or would be a good addition please let me know. Any information of any kind would also be appreciated, always good to ehar other people's experiences of similar projects. Cheers, Kev.
  19. Hi John, Thanks for that. Yeah I realise the newer SG's and the SGP's have adjustable top burrs; however, I have quite an old SG which doesn't have the adjustable top burr. It'll grind fine enough but it's at its finest setting so I'll have to investigate further to gather sizes and obtain my own shims. It was just in case someone had the correct ID & OD of the shims to hand.
  20. Sorry to bring this thread up out of history but does anyone happen to have the inner and outer diameters of the shims? Or where to buy them? Failing that I'll whip the burr off and get the verniers out... Cheere
  21. KitchenAid Artisan for £41 fully working. Sage Smart Grinder Rancilio Silvia wand for KA and pressure guage KA working fine and already adjustes OPV to 9-9.5 bar. This is my project machine as I'll hopefully be investing in a nice HX machine in a few months. Plans are Arduino controlled PID, pressure, volumetric, etc etc plus a full overhaul and rewire.
  22. Nouva Simonelli Oscar II might fit the bill? Around £600 but I believe you might need the OPV mod done (about £40) if left on all day just to be on the safe side. I should mentioned Elektros sell this with the mod carried out as well without voiding warranty.
  23. Another avg effort from the Creatista. I do enjoy the cups/saucers though
  24. Recently sold my Gaggia Classic and manual grinder as I was making Aeropress in the morning for convenience. When guests were round it was french press. I recently bought a Creatista Plus (Nespresso) to solve both problems at the moment whilst I mull over my options (probably HX). Nespresso makes a coffee your average coffee drinker enjoys so I'll live with it for a bit (meanwhile I'll enjoy my hollow life and coffees ) Out in the campervan it's Aeropress.
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