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As the association at Bozeman Hot Springs conductor their hot springs and spa into the 21st aeon with new technology and pools, they are cerebration about new means to contentment their barter and break top of mind. One alternating request, no agnosticism from the ardent skiing community, is the adeptness to apprehend accepted basin temperatures online, in the aforementioned way ski resorts broadcast accepted snow conditions. This action makes that dream a absoluteness by amalgam with the absolute standalone basin temperature controllers and publishing temperature abstracts over the internet appliance an calmly captivated API.
There are three anew complete alfresco pools that use the latest and greatest accessories and controllers from Honeywell to advance temperature, accurately the Honeywell T755M. The botheration is, the temperature abstracts acclimated by the controllers is trapped on the controllers themselves. There’s no way to broadcast these temperature readings over the arrangement after added hardware.
There needs to be a average man to accomplish faculty of the abstracts provided by the standalone temperature controllers and again broadcast said abstracts over the network. Enter the TS-7680 with its four analog to agenda inputs, wireless arrangement interface and low amount artificial asylum with DIN mount. For approaching expansion, the TS-7680 supports the TS-1700 Modbus borderline that enables eight added temperature sensors for added pools.
With several hot bounce resorts in the area, there is a aggressive advantage to actuality able to broadcast basin temperatures in absolute time. Not alone are barter able to acquaint themselves and plan a cruise accordingly, they’ll additionally accumulate blockage aback daily, befitting Bozeman Hot Springs top of mind, while they dream of their abutting trip. There are additionally advantages on the business end for basin maintenance, like actuality able to collect, abundance and blueprint out basin temperatures over time and alike get email or SMS alerts for back temperatures acutely change. A arrangement like this additionally lays a foundation for added high-tech improvements, such as announcement alive basin abstracts on a wall-mounted LCD awning for visitors to see.
The Honeywell T775M standalone controllers are a acute basic we charge be able to interface with. They are already annual from temperature sensors installed in the pool’s accumulation aqueduct and outputting commands to acclimatize hot or algid baptize flow. Luckily, there are two outputs, MOD1 (used) and MOD2 (spare), and anniversary are configurable to apprehend from a specific sensor ascribe and achievement a 2–10 VDC amount based on programmable variables. So, to accumulate temperature abstracts from all three of the controllers, we’ll charge a arrangement with at atomic three analog to agenda inputs.
For networking, a wireless captive already has been installed in the aforementioned allowance as the Honeywell controllers. Luckily, a networking arbor with switches is additionally installed nearby, but wireless is acceptable so we don’t acquire to run cable to the rack.
While technically we could run our own sensors and bypass the Honeywell controllers, it’s actual nice to acquire a distinct sensor to accord with, abnormally back the cabling has already been baffled accurately through metal conduit. Not to acknowledgment there is a slight amount accumulation and beneath aliment worries.
The T755M controllers are army on a allotment of plywood absorbed to a accurate wall. This bureaucracy is absolute for a simple DIN abuse on which to arise our alien system.
Periodically, clarify and pump aliment will be performed in the aforementioned allowance as the ambassador and alien system, which makes for a high-humidity environment, so we’ll charge to acquire our arrangement amid for protection.
Approaching amplification to the added six pools not absorbed up to a Honeywell ambassador would be acceptable to consider. A arrangement that has additional analog to agenda inputs and amplification options is necessary.
All considerations taken into account, the TS-7680 is a absolute match. It has four ADC (0–10 VDC) inputs, DIN mountable enclosure, wireless 802.11a/b/g bore and Modbus anchorage for amplification (TS-1700 8x Temperature Sensor Peripheral).
Software-wise, we’ll charge to apprehend from the ADC inputs of the TS-7680 and again serve them. To apprehend the ADC inputs, we’ll body aloft archetype C cipher provided by Technologic Systems. Back confined this data, we appetite to accomplish it as accessible as accessible for our website or added systems to consume. This is able appliance a REST API, a frequently acclimated and accepted API for those alive in the Internet of Things (IoT) or Web of Things (WoT) domain. For this, we’ll ability for node.js and pm2, which makes it appealing accessible to set up a simple, easy-to-consume REST API server after the charge to absorb heavyweights like Apache. For alike faster development, we’ll ability for the node.js bore restify.
This is area the fun actuality starts happening! The absolute planning appearance started with a cruise to Bozeman Hot Springs to get a bout of the accessories and how they operate. This is area we were aboriginal alien to the Honeywell T775M controllers and saw area temperature abstracts is collected. Cracking accessible the asylum of the T775M, we activate some acutely apparent spiral terminal connectors, of which the best absorbing was the MOD1 and MOD2 outputs. MOD1 already was taken in adjustment to ascendancy the baptize valves to advance temperature of the pool, but MOD2 was chargeless for the taking. Not alone that, but a quick advertence to the chiral showed it accurate 2–10 VDC output. Perfect!
We contacted Honeywell and asked if there was a way that we could use MOD2 to achievement the abstracts from Sensor A, which is anon affiliated to the pool’s assimilation pipe. Once confirmed, we absitively to use the TS-7680 and started to work!
We started with a base diagram of how we were action to affix the TS-7680 with the three T775M controllers. Alone two affairs were all-important from anniversary unit. The arena affairs were all affiliated calm and absorbed up to the basal spiral terminal (Pin 1). The VDC achievement affairs were affiliated to AN0, AN1 and AN2 analog inputs of the aforementioned spiral terminal adapter (Pin 2, 3 and 4, respectively).
In adjustment to achievement the accepted temperature abstracts from MOD2, we had to configure it as follows:
The throttling ambit brackets the setpoint, giving us a temperature ambit of 80°F to 120°F. Back we apprehend 10 VDC from MOD2, it represents 80°F. Similarly, 2 VDC represents 120°F and in between, 6 VDC represents 100°F. If this seems astern to you, it’s because we are in the heating mode. The ambassador is advised to ascendancy a valve in adjustment to calefaction or air-conditioned the basin back it alcove our threshold. We’re arrangement of cheating actuality to get a beeline temperature model. Plugging our x (temperature) and y (voltage in mV) ethics it into a abruptness ambush anatomy (y = mx b), so we end up with the blueprint y = -200x 26000. Solving for our temperature (x), we get x = (y – 26000) / -200, which is the aforementioned blueprint you’ll acquisition in the antecedent code. With our assignment on ambience up the controllers complete, it’s time to move on to the software ancillary of things.
After downloading the accustomed mx28adcctl sample cipher from Technologic Systems assimilate our TS-7680 board, we started modifying the main() action to acquire a distinct altercation of which analog ascribe pin to apprehend from. For example, to apprehend the voltage on AN0, we artlessly run ./getadc 0, and we’ll acquire a acknowledgment amount in mV. For prototyping, AN0 and AN2 were absorbed up to affiliated 3.3 VDC, while AN1 was absorbed up to a capricious trimpot (0–3.3 VDC).
Pro Tip: In adjustment to alarm this action as a non-root user, you’ll charge to run chown root:root getadc and chmod 4755 getadc to accomplish basis the buyer of the bifold and about-face on the SUID permissions bit. The included Makefile does this for you.
Although unnecessary, we capital to see at atomic some cachet indicator for back the temperatures were actuality read, so we could see if the assemblage is active. The TS-7680 asylum has a chicken LED apparent “Activity”, angry to GPIO #58, so we took advantage of that in our getadc program. Back the affairs fetches data, the action LED will flash. Again, archetype cipher for ambidextrous with GPIO appliance the sysfs interface provided by Technologic Systems fabricated quick assignment of this. For added advice about appliance the sysfs interface, booty a attending at our commodity “Robust C Library and Utility for GPIO sysfs Interface in Linux”.
Now that we can apprehend voltages, we activate on coding our API. There are several assets accessible for creating a REST API appliance Restify, so it was accessible to actualize a brace of routes (API endpoints) for integrations to use.
GET /temperatures — allotment a JSON arrangement with all three basin temperature abstracts objects.
GET /temperatures/:pool_id — allotment JSON commodity with :pool_id temperature abstracts area :pool_id is amid 0 and 2.
Archetype acknowledgment from GET /temperatures:
Additionally note: instructions for ambience up the node.js app that admiral our API can be activate in the embeddedarm/bhs-api repository’s README file.
A simple web folio was created as a affirmation and affidavit of abstraction for announcement the temperature abstracts online. It uses jQuery and AJAX to accomplish a alarm to the REST API server and uses the alternate JSON commodity to affectation data. This is done every 10 abnormal to appearance off the capabilities of announcement “real-time” (quote-unquote) temperature data.
The aftermost footfall of development was absolutely to install the TS-7680. A DIN abuse was busted to the plywood bank abutting to the T775M controllers, and the amid TS-7680 was army on it. As planned in the base diagram, amalgamation affairs affiliated MOD2 of anniversary ambassador to the spiral terminal adapter of the TS-7680. Ability was activated to the TS-7680 appliance the PS-12VDC-REG-3PB ability accumulation acquainted in to a adjacent bank outlet.
For networking, the TS-7680’s wireless interface was configured to back an IP abode via DHCP and associated with the SSID and countersign of the Bozeman Hot Springs wireless admission point. The networking ambassador was alleged in to accredit a aloof IP abode for the MAC abode of the wireless interface and anchorage advanced 8080 to said aloof IP address. The website ambassador was again alleged in to accommodate us with a subdomain for accessible admission to the anew installed TS-7680 API server, appropriately absolute our TS-7680 development and installation.
The bake-apple of our labors is a nice-looking, acutely displayed accoutrement assuming off basin temperature abstracts provided by our API server for barter to see. Time will acquaint if this has any appulse on sales and business, but barter already acquire started to acclaim the accession to the website in such a abbreviate time back action live.
Of course, this is aloof the alpha of what can now be accomplished. A aliment dashboard can be developed to affectation actual temperature trends and accelerate alerts for back the abrupt happens. Informing visitors of accepted basin temperatures appliance a agenda awning instead of a dry-erase brand lath can now be done. Approaching amplification to added pools, including those that are currently beneath construction, is an option, acknowledgment to TS-1700 support. Added sensors can be added and appear on through the API server as well.
Overall, this action has provided Bozeman Hot Springs with a abundant foundation in bringing their pools into the 21st aeon and IoT domain. We’re attractive advanced to alive calm in the future. In the meantime, we do achievement this has aggressive you in some way to advance your own IoT appliance application Technologic Systems’ anchored products. If you’re active with anticipation, amuse ability out to our sales and engineering teams. They adulation audition about new and agitative applications.
Here’s a quick bullet-point appearance of the genitalia and abstracts acclimated in this project.
TS-7680 Distinct Lath Computer with AC Power, Relays, and WiFi (TS-7680-256-4GF-I-DEV, KIT-7680, CB-ANT-TIWI, TS-ENC768-DIN, PS-12VDC-REG-3PB)
DIN Abuse with ascent screws (hacksaw and book to cut to length)
Hook-up wire (22 AWG) in assorted colors
Honeywell T755M Standalone Temperature Ambassador (per pool)
Development workstation (Mac OSX, Linux, or Windows)
Linux Server with node.js and pm2 installed
Antecedent Code: embeddedarm/bhs-api on GitHub.org.
This commodity is sponsored by Technologic Systems.
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