To be accurate, Peltier is to convert electricity into heat/cold. And Seebeck is the opposite. But isn't important.
Niclas On Feb 23, 2016 4:11 AM, "Jiri Jetmar" <[email protected]> wrote: > Agree, touch sensors are not accurate, but often used here in Germany. > > "Peltier; you mean a Seebeck element ;-)" > > Seems that they are called here "Peltier" > > Elements" https://en.wikipedia.org/wiki/Thermoelectric_effect > > The reason might be, that the guys Seebeck and Peltier independently > discovered the thermoelectric effect.. :-) > > "It is more research than I can afford at the moment, bit definitely > an interesting > area." > > Yes, indeed, it goes to the topic of energy harvesting. > > https://www.youtube.com/watch?v=IvMeGX0aI08 > > Cheers, > Jiri > > > > 2016-02-22 12:37 GMT+01:00 Niclas Hedhman <[email protected]>: > > > Touch sensors are a little bit tricky, if you want a reasonable amount of > > accuracy. A lot of losses unless very well insulated. > > That said, the challenge is not so much the electronics but the > mechanical > > part. Easy to install is the main factor, and power supply is a primary > > concern... Will leave this for a bit later. > > > > Peltier; you mean a Seebeck element ;-) > > It is not trivial to collect, but something I have been thinking about > for > > more than a year. Without very clunky mechanical arrangements, the > > extraction is very small and power budget becomes a major challenge. It > is > > more research than I can afford at the moment, bit definitely an > > interesting area. > > > > Niclas > > On Feb 21, 2016 9:22 PM, "Jiri Jetmar" <[email protected]> wrote: > > > > > Sounds impressive.. ! > > > > > > another usecase for a Wifi temperature sensor. What about to put a > little > > > magnet to it > > > so that it sticks on a heating body. > > > > > > With a peltier element it would be eventually possible to generate > enough > > > power (from the temperature delta) over > > > the day for a transmission. > > > > > > Cheers, > > > Jiri > > > > > > 2016-02-21 3:50 GMT+01:00 Niclas Hedhman <[email protected]>: > > > > > > > Update; Yesterday I located the last major bug in the Forth > > interpreter. > > > > Yay!!! > > > > > > > > ~1k assembler instructions, and ~8kbytes of RAM space for the > > JonesForth > > > > vocabulary. > > > > > > > > Today I am starting on a TCP socket for the REPL, instead of the > serial > > > > port used so far. > > > > > > > > GPIO, ADC and other peripherals will be very straight forward memory > > > > operations. Probably borrow from > > > http://wiki.laptop.org/go/Forth_Lesson_22 > > > > > > > > I have also decided on the multitasking model, and going for an Actor > > > model > > > > similar to Erlang, but adopted for Forth concepts (messages on > stack). > > > > Still not sure how to do memory allocation separation in a good > manner, > > > but > > > > I'll get there. > > > > > > > > Cheers > > > > Niclas > > > > > > > > On Mon, Feb 15, 2016 at 3:54 PM, Niclas Hedhman <[email protected]> > > > wrote: > > > > > > > > > > > > > > This thread is well off-topic, but we are a small group of friendly > > > > people > > > > > so I don't mind. Someone else might, and if so... Speak up. > > > > > > > > > > Jiri; powering is an interesting longer term challenge. I don't > want > > > too > > > > > much on the plate in the beginning, and rather have a MVP going out > > the > > > > > door now, than solving a larger task by next year. > > > > > But I like your idea, and should research it further. The peek > power > > > > > however is more like 700mW at full WiFi transmit. Super-capacitor > to > > > the > > > > > rescue, I guess. > > > > > > > > > > Roman; I have always been fascinated by the simplicity of Forth, > and > > it > > > > > has been fun doing Assembler again. > > > > > Forth isn't necessary for the temperature sensor device and the > > sensor > > > > > network built on top of it. But I want to see if it makes sense to > > > > create a > > > > > user programmable platform on top of Forth, for automation systems > > > > > integrators can use. I did a block programming system in Java for > > this > > > > > purpose, and think I can run the same thing on Forth and a fraction > > in > > > > > size. My target for that is the upcoming ESP-32, dual core and a > > > whopping > > > > > 400kB or so of usable RAM. The CEO told me over beer, that it is > > > expected > > > > > to only cost about 20% more... > > > > > > > > > > So, one of the next steps is a WiFi PID regulator, programmable, > > maybe > > > > two > > > > > inputs and a single 0-10V output. > > > > > > > > > > Again, the monitoring, control and data management on top will be > > key, > > > > > together with the local network management for devices to work in > > > unison, > > > > > and the security needed whilst keeping it easy to use. > > > > > > > > > > I have heard that NASA uses Forth in missions, but don't know if > this > > > is > > > > > still the case, or just surviving rumours from the 80s. But as we > > ride > > > > hard > > > > > into explosion of super-tiny devices, I think it is the only > feasible > > > > > alternative to C, and more often than not provides more compact > code. > > > > > > > > > > My implementation for ESP8266 is far from done. I am currently > > chasing > > > a > > > > > bug in the compile system, as it seems that the compile > BEGIN...UNTIL > > > > > and/or IF...ELSE...THEN gets compiled with incorrect jump > addresses. > > > > > Hopefully I can sort that out in one of these evenings... > > > > > After that, I will turn my focus to; > > > > > > > > > > * Serial over WiFI socket instead of serial ports. > > > > > > > > > > * GPIO, PWM, ADC and other microcontroller functions. > > > > > > > > > > * Async message queues, so I can do... > > > > > > > > > > * Multitasking > > > > > > > > > > * pre-compile the FORTH vocabulary to ROMable code and not occupy > > the > > > > > RAM. > > > > > > > > > > Anyway, I am putting up Jiri and Roman on the list for the field > > test. > > > > > > > > > > Cheers > > > > > Niclas > > > > > On Feb 15, 2016 14:23, "Roman Shaposhnik" <[email protected]> > > > wrote: > > > > > > > > > >> On Fri, Feb 12, 2016 at 7:58 PM, Niclas Hedhman < > [email protected] > > > > > > > >> wrote: > > > > >> > Gang, > > > > >> > > > > > >> > I haven't had much time on Zest lately, as I have been busy > > > creating a > > > > >> > low-costWiFi capable, USB-powered temperature sensor. See > > > > >> > http://hedhman.org/~niclas/IndoorioD.jpg > > > > >> > > > > > >> > And for the fun of it, I ported FORTH programming language to > the > > > > >> ESP8266 > > > > >> > CPU that is on this, in Assembler of course. Interpreter, > > Compiler, > > > > base > > > > >> > vocabulary (functions) and REPL in ~1000 assembler instructions, > > and > > > > the > > > > >> > full vocabulary in another 10kbytes or so. It has been a lot of > > fun. > > > > >> > > > > >> This is the point where you got my attention 110% ;-) > > > > >> > > > > >> > This little puppy will go for one more round of prototypes next > > > week, > > > > >> as I > > > > >> > want to add an external watchdog and tiny prototyping area for > > maker > > > > >> > community. Then I intend to make a field test with 100 units or > > so. > > > > >> > > > > > >> > So, why am I telling you all this? > > > > >> > > > > > >> > First of all, these guys will report the temperature back to a > > > central > > > > >> > server every 15 minutes or so. And the management system on the > > > server > > > > >> is > > > > >> > written with Zest. The rest is with Grafana and ElasticSearch. I > > am > > > > >> > considering trying to build a business around data capture, > > > > aggregation, > > > > >> > analytics and visualization. Anyone interested to join? > > > > >> > > > > >> I'd love to chat about what you've got in mind. > > > > >> > > > > >> > Secondly, I am looking for volunteers for my field test. It will > > > > >> probably > > > > >> > happen in April or so. If you participate, you will receive a > USB > > > > >> powered > > > > >> > sensor as seen. Plug it into power somewhere for 6 months, > connect > > > to > > > > it > > > > >> > over WiFi, configure it to use your WiFi router over a simple > web > > > > >> > interface, and keep it powered for 6 months. > > > > >> > If there are problems, I might ask for reboot. Hopefully not any > > > > >> firmware > > > > >> > upgrades. > > > > >> > > > > >> I'd love to help. More so than that -- I'd love to tinker. > > > > >> > > > > >> Thanks, > > > > >> Roman. > > > > >> > > > > > > > > > > > > > > > > > -- > > > > Niclas Hedhman, Software Developer > > > > http://zest.apache.org - New Energy for Java > > > > > > > > > >
