Cishe ngokuqinisekile inzwa yakho yokushisa isebenza kahle kakhulu ngendlela eyakhiwe ngayo. Inkinga ukuthi ayikali umoya ojwayelekile wasekilasini lakho; ikala isimo sokushisa esikhiqizwa yi-ESP32 ehlezi eceleni kwayo. Uma imojula ye-DHT11, DHT22, noma ye-BME280 ixhunywe kuyo leyo breadboard efanayo, i-PCB eyenziwe ngokwezifiso, noma ibhokisi eliphrintwe nge-3D lapho kukhona khona ibhodi le-ESP32, ukushisa okuphuma ebhodini kukhuphula ukufundwa kwezinga lokushisa ngo-2°C kuya ku-5°C, kanti kunciphisa ukufundwa komswakama ngama-10% kuya kuma-20%.

Emiklamweni yamarobhothi ne-IoT yasekilasini, imvamisa abantu bavele basukele ukubhala isixazululo esisheshayo se-software: ukususa amadigri amane enanini elitholakele (float value). Lowo umkhuba omubi wobunjiniyela wokufundisa abafundi. Umehluko wokushisa uyashintshashintsha, awuhlelekile ngendlela eqondile elinganayo. Uyashintsha kuye ngemijikelezo yokuthumela kwe-Wi-Fi, ukungena komoya ekilasini, nokuthi ingabe i-microcontroller imatasa ifunda izinzwa noma ayenzi lutho.

Izimbangela Ezimbili Eziyinhloko: Ama-Linear Regulator Nokuqhuma Kwe-Wi-Fi

Ibhodi le-ESP32 (njengamabhodi ajwayelekile e-NodeMCU anezikhonkwane ezingama-30 noma ezingama-38 atholakala ezikoleni zaseNingizimu Afrika) lithola amandla ngoxhano lwe-USB olungu-5V. Nokho, i-ESP32 system-on-chip (SoC) isebenza ngo-3.3V. Ukwehla kwamandla kagesi phakathi kuka-5V no-3.3V kumuncwa yi-low-dropout linear regulator (LDO) esebhodini, ngokuvamile eyi-AMS1117 noma i-chip efanayo.

Ama-linear regulator ehlisa amandla kagesi ngokukhipha amandla angaphezulu njengokushisa. Izibalo zicacile: ukwehlisa u-5.0V ube ngu-3.3V kushiya umehluko ongu-1.7V. Uma i-ESP32 isebenzisa ama-core ayo amabili e-Tensilica kanti nemojula ye-Wi-Fi ivuliwe, idonsa amandla kagesi aphakathi kuka-80mA no-130mA, kanti la mandla angaqubuka afinyelele ku-250mA kuya ku-400mA ngesikhathi kuthunyelwa idatha ye-RF. Lokho kusho ukuthi i-regulator encane esebhodini lakho ikhipha ngokuqhubekayo amandla okushisa aphakathi kuka-140mW no-220mW ngqo ezinsimbini zethusi ze-PCB.

Ngesikhathi esifanayo, i-ESP32 SoC ngokwayo iyashisa. I-amplifier yamandla e-RF yangaphakathi esebenza ku-2.4 GHz 802.11b/g/n ikhiqiza ukushisa ngaphakathi kwesivikelo sensimbi. Uma inzwa yakho ihlezi ebangeni elingamasentimitha amabili noma amathathu ukusuka kuleyo nsimbi noma ku-LDO, isebenza ngaphakathi kwalelo qoqo lokushisa.

Indlela Ukushisa Okudluliselwa Ngayo: Ngokuthintana Nangokuvaleleka Ebhokisini

Ukushisa kufinyelela enzweni yakho ngezindlela ezintathu eziyinhloko lapho kwakhiwa emakilasini:

• Imigqa Yethusi Ye-Breadboard: Ama-breadboard enziwe ngeplastiki ngaphandle, kodwa ngaphakathi anezinsimbi zethusi ezigobile ezihambisanayo. Uma izikhonkwane zamandla ne-ground ze-ESP32 zishisa, lawo mandla okushisa ahamba ngqo kulezo zinsimbi aye ezikhonkwaneni ezingomakhelwane lapho kuxhunywe khona inzwa yakho.
• Ukuzishisa Kwe-MEMS: I-Bosch BME280 iyinzwa encane ye-MEMS (micro-electro-mechanical system). Uma abafundi beyimisa kumodi eqhubekayo ye-'Normal' enezinga eliphezulu lokuhlola, beyifunda ngokuqhubekayo ku-loop engapheli ye-Arduino, izingxenye zikagesi zangaphakathi zenzwa ziyafudumala ngokwazo.
• Umoya Ovalelekile Ebhokisini: Lapho abafundi befaka isiteshi sezulu se-IoT ebhokisini elincane eliphrintwe nge-3D noma ebhokisini le-ABS ukuze balivikele ezingozini zasekilasini, ukuhamba komoya kuyama. I-LDO isebenza njengesifudumezi esincane esikhipha u-200mW ngaphakathi kwebhokisi elivaliwe. Phakathi nemizuzu eyishumi, umoya ongaphakathi ebhokisini uba phezulu kakhulu kunezinga lokushisa elijwayelekile legumbi.

Izixazululo Ezisebenzayo Ezingasetshenziswa Ekilasini

Esikhundleni sokulungisa i-firmware ngokubala okungahleliwe kokususa izinombolo, sebenzisa le nkinga njengesifundo esiwusizo ekwakhiweni kokulawula ukushisa nasekuphathweni kwamandla e-firmware.

1. Ukuhlukanisa Ngokomzimba (Ukuqhelelanisa Ukushisa)

Isixazululo esisodwa esisebenza kangcono kakhulu ibanga lomzimba. Susa i-DHT22 noma i-BME280 ngokuphelele ebhodini le-microcontroller. Ukuxhuma inzwa ngentambo eyiribhoni engu-10 cm noma engu-15 cm noma ukuyifaka endaweni eqhelile kuqeda ngokushesha ukuthintana kokushisa okuvela ku-PCB. Ngaphezu kwalokho, ngenxa yokuthi umoya ofudumele uyenyuka, hlala ubeka inzwa ngaphansi noma eceleni kwe-ESP32, ungalokothi uyibeke ngqo ngaphezu kwayo.

2. Shintsha Uhlelo Lwe-Firmware: Funda Kuqala, Uthumele Kamuva

Amakhodi amaningi aqalayo e-IoT alandela lokhu kulandelana: xhuma ku-Wi-Fi, vula i-MQTT noma i-HTTP, funda inzwa, thumela idatha, ima imizuzwana emibili, phinda futhi. Ngokugcina i-Wi-Fi ivuliwe ngaso sonke isikhathi, ibhodi alilokothi liphole.

Kunalokho, hlela kabusha uhlelo ukuze lusebenzise i-deep sleep, ikakhulukazi eziteshini eziqoqa idatha:

• Vusa i-ESP32 ku-deep sleep (umsakazo we-Wi-Fi uhlala uvaliwe).
• Funda inzwa yokushisa nomswakama ngokushesha ngenkathi ibhodi lisabanda.
• Vula umsakazo we-Wi-Fi, xhuma kunethiwekhi yesikole, thumela idatha, bese uvala umsakazo ngokushesha.
• Buyisela i-ESP32 ku-deep sleep imizuzwana engama-60 kuya kwengama-300.

Ku-deep sleep, amandla adonswayo ehla kakhulu ukusuka ku-~100mA aye kuma-microamp kumamojula angenalutho (noma ku-1–3mA emabhodini anezixhumi ze-USB). I-LDO iphola ngokuphelele, futhi ukufundwa kwedatha kubonisa umoya wangempela wegumbi kunokushisa okuphuma ku-silicon.

3. Lungiselela Izinzwa Zisebenzise Izindlela Zamandla Aphansi

Uma usebenzisa i-BME280 usebenzisa imitapo yolwazi efana neyase-Adafruit, ungayishiyi kwimodi eqhubekayo yokuhlola. Shintshela inzwa ku-'Forced Mode'. Ku-Forced Mode, inzwa iyalala, ithathe isilinganiso esisodwa kuphela lapho iceliwe, ibuyise idatha, bese iphinde ibuyela ebuthongweni ngokuzenzakalelayo. Ekuqapheni umoya wasekilasini, ukufunda kanye njalo ngemizuzwana engama-30 kuya kwengama-60 kwanele kakhulu.

Ukufundisa Umkhuba Omuhle Wobunjiniyela

Lapho abafundi bebona isiteshi sabo sezulu sibika ukuthi kune-26°C kanti ithemometha esodongeni ibonisa ngokucacile ukuthi kune-22°C, kuhlale kulula ukukuthatha njengephutha lezingxenye ezishibhile. Akuvamile ukuba njalo. Ukuhlola isistimu ngethemometha ye-infrared kubonisa ngokushesha ukuthi i-ESP32 SoC ishisa ifinyelele ku-35°C noma ngaphezulu ntambama lapho kufudumele.

Ukufundisa abafundi ukuthola umthombo wokushisa wangempela, ukukala ukwehla kwamandla kagesi ku-regulator, nokuhlela kabusha ukubekwa kwezingxenye kwakha amakhono angempela obunjiniyela. Uma isikole sakho sifaka imishini ye-telemetry exhumene emakilasini noma emhubheni yezolimo (tunnels), ukuhlola ukubekwa okujwayelekile kwezinzwa nezakhiwo ze-IoT ezisebenzisa amandla aphansi nge-Sheen IoT learning modules kunikeza indlela ehlelekile yokusebenzisa le mikhomba ebalulekile yehadiwe ngaphandle kokubuyela emuva uqale ukuklama isekethe phansi.