Ukubala Ubukhulu beSolar neBhetri yeSensor ye-ESP32 yaseFama eBusika
Ukuze ugcine i-node ye-telemetry ye-ESP32 isebenza ubusuku nemini (24/7) ebusika, udinga iseli enye ye-18650 ye-2 200–2 600 mAh kunye nepaneli yelanga ye-2W ukuya ku-5W (5V/6V)—ukuba nje indlela yombane ye-deep-sleep yakhiwe ngokufanelekileyo.
Ukuze ugcine i-node ye-telemetry ye-ESP32 isebenza ubusuku nemini (24/7) ebusika baseMzantsi Afrika ithumela iirekhodi qho kwimizuzu eli-15, udinga iseli enye ye-lithium-ion 18650 ye-2,200–2,600 mAh kunye nepaneli yelanga ye-monocrystalline ye-2W ukuya ku-5W (5V okanye 6V). Inkqubo yombane iyonke ixabisa ngaphantsi kwe-R250 kwi-node nganye. Nangona kunjalo, olu balo lusebenza kuphela xa ulungisa eyona ngxaki inkulu yokuvuza kombane kwiiprojekthi ze-IoT zabafundi naseklasini: umsinga ongasebenziyo webhodi (board-level quiescent current).
Umgibe we-Quiescent Current
I-chip ye-ESP32 ekwimo yokulala kakhulu (deep sleep) itsala malunga ne-10 ukuya kwi-15 le-microamps (µA). Ukanti ootitshala nabafundi badla ngokusebenzisa iibhodi zophuhliso eziqhelekileyo (ezifana ne-NodeMCU ESP32 okanye i-ESP32 DevKit V1) baze bafumanise ukuba ibhetri ye-2,500 mAh iyaphela ngeentsuku ezintathu ngaphandle kokukhanya kwelanga. Ngoba?
Iibhodi eziqhelekileyo zokwenza iiprototypes zinezinto ezimbini ezitya umbane kakhulu ezingaze zilale:
- I-USB-to-UART bridge (efana ne-CP2102 okanye i-CH340), eqhubeka nokutsala i-0.5 mA ukuya kwi-15 mA nokuba akukho thambo le-USB liqhagamshelweyo.
- I-regulator ye-Low Dropout (LDO) (ngokuqhelekileyo eyi-AMS1117-3.3), enomsinga ongasebenziyo (quiescent current) omalunga ne-5 mA ukuya kwi-10 mA ngokugcina nje umgca wayo wemveliso usebenza.
Ibhodi etsala i-10 mA ngexesha "lokulala" idla i-240 mAh suku ngalunye ngokuhlala nje ingasebenzi. Ngokwahlukileyo koko, ibhodi ye-ESP32 esebenzisa i-regulator ene-quiescent ephantsi (njenge-HT7333 okanye i-ME6211, etsala i-≤50 µA) idityaniswe ne-USB bridge engenambane yehlisa ukusetyenziswa kombane kwemihla ngemihla xa ilele ukuya ngaphantsi kwe-2 mAh.
Ubalo Lombane: Imijikelezo Yokuvuka yeMizuzu eli-15
Masibale imfuno yamandla yemihla ngemihla ye-sensor eqhelekileyo yokufuma komhlaba nobushushu bendawo ethumela i-telemetry kwi-broker ye-MQTT nge-Wi-Fi ye-2.4 GHz.
1. Imeko Yokusebenza (Ukuvuka nokuthumela)
- Utsalo lomsinga: i-avareji emalunga ne-180 mA ngexesha loqhagamshelo lwe-Wi-Fi nokuthumela.
- Ixesha elithathwayo: imizuzwana emi-4 (ukuqala, ukufunda ii-sensor ze-ADC/I2C, ukuqhagamshela kwi-Wi-Fi, ukupapasha i-payload, ukungena kwi-deep sleep).
- Amaxesha: Qho kwimizuzu eli-15 = ka-4 ngeyure = ukuthumela oku-96 ngosuku.
- Amandla ngothumelo ngalunye: 180 mA × (4 s / 3,600 s) = 0.20 mAh.
- Ukusetyenziswa kwemihla ngemihla kusebenza: 96 × 0.20 mAh = 19.2 mAh/ngosuku.
2. Imeko ye-Deep Sleep (Ukulala Kakhulu)
- Utsalo lomsinga (i-hardware elungisiweyo): 0.05 mA (50 µA).
- Ixesha elithathwayo: iiyure ezingama-24 thabatha ~imizuzu eyi-6.4 yexesha lokusebenza ≈ iiyure ezingama-23.9.
- Ukusetyenziswa kombane ngosuku ilele: 23.9 h × 0.05 mA = 1.2 mAh/ngosuku.
Ukusetyenziswa kombane kuko konke ngosuku: 19.2 mAh + 1.2 mAh ≈ 20.4 mAh ngosuku ku-3.3V (malunga ne-0.07 Wh ngosuku). Nokuba kusebhodi engalungiswanga ehleli kwi-3 mA, imfuno yemihla ngemihla inyuka ifikelele malunga ne-90 mAh ngosuku.
Ukubala Ubukhulu beBhetri ye-18650 ukuze Ikwazi Ukuzimela
Kwiimeko zobusika zaseMzantsi Afrika—ingakumbi imimoya ebandayo yaseNtshona Koloni okanye amafu amade kwenye indawo—kufuneka ucebe iintsuku ezi-5 ezilandelelanayo ezingenako kwaphela ukukhanya kwelanga okusebenzisekayo.
| Ulwakhiwo lweBhodi | Umthwalo weMihla le | Imfuno yokuZimela yeentsuku ezi-5 | Umthamo weBhetri oCetyiswayo |
|---|---|---|---|
| I-Node eLungisiweyo (≤50 µA ilele) | ~21 mAh | 105 mAh | 1× 18650 (2,200–2,600 mAh) |
| I-DevKit Eqhelekileyo (~3 mA ilele) | ~92 mAh | 460 mAh | 1× 18650 (2,600 mAh) |
| I-DevKit eNgalungiswanga (~12 mA ilele) | ~308 mAh | 1,540 mAh | 2× 18650 ngaxeshanye (in parallel) |
Iseli enye eqhelekileyo ye-18650 ye-2,200 mAh ukuya ku-2,600 mAh inika umthamo owongezelelweyo omkhulu kwi-sensor elungisiweyo. Nokuba sithintela ukukhutshwa kombane kumlinganiselo ophilileyo we-20%–80% depth-of-discharge (DoD) ukuqinisekisa ubomi beseli yeminyaka emihlanu, umthamo osebenzisekayo we-1,300 mAh uqinisekisa ukusebenza ngokuzimeleyo ngaphezu kweentsuku ezingama-40 ngaphandle kwelanga kwi-hardware ecocekileyo.
Ukubala Ubukhulu bePaneli yeSolar ngokweeyure zeLanga zaseBusika
Iiyure zeLanga eliPhezulu (Peak Sun Hours - PSH) zasebusika eMzantsi Afrika zehla kakhulu kuxhomekeke kwindawo okuyo. Ubusika baseKapa bufumana i-avareji emalunga ne-2.5 ukuya ku-3.0 PSH ngenxa yemvula namafu amakhulu, ngelixa i-Highveld igcina i-4.0 ukuya ku-4.5 PSH nangona kubanda.
Sibala eyona meko imbi kakhulu (2.5 PSH):
- Imfuno yaMandla yeMihla le: 21 mAh × 3.7V nominal = ~0.08 Wh.
- Ilahleko yeNkqubo: Bala ukusebenza kakuhle okudityanisiweyo kwe-60% (uthatha ingqalelo yothuli kwipaneli, ukuhla kombane kwi-solar charge controller ye-TP4056/CN3065, kunye nokusebenza kwekhemikhali yokutshaja kwebhetri).
- Ukuveliswa kweMihla le okuFunekayo: 0.08 Wh / 0.60 = 0.133 Wh/ngosuku.
- Eyona Wattage incinci yePaneli: 0.133 Wh / 2.5 PSH = 0.053 W (53 mW).
Ngokwezibalo, ipaneli encinci ye-0.5W inokunika le node amandla phantsi kwelanga elifanelekileyo laselebhu. Ngokwenyani, kufuneka usebenzise ipaneli ye-2W ukuya ku-5W, 5V okanye 6V. Kutheni kukho lo mda wokhuseleko ophindwe ka-40×? Ngeentsuku zasebusika ezinamafu amakhulu, ukufika kwemitha yelanga kwehla kuye kwi-5%–10% yokukhanya kwemini epheleleyo. Ipaneli ye-5W phantsi kwamafu amnyama asakwazi ukuvelisa i-100 mW ukuya kwi-250 mW—eyaneleyo ukuhlawulela iindleko zokusebenza nokugcina ibhetri ingangeni ngaphantsi komda wokucima.
Uluhlu Lokujonga Phambi Kokufaka (Checklist) Entsimini
- Ukutshekisa iPaneli (Tilt): Yenza ipaneli yakho ijonge kuMntla wokwenyani (true North) itshekiswe kwi-latitude yendawo yakho dibanisa i-10° ukuya kwi-15° (malunga ne-45° eNtshona Koloni, 38° eGauteng). Le angle ithambekileyo ibamba ngokuthe ngqo ilanga lasebusika eliphantsi kwaye ikhupha imvula yasebusika nothuli ngokwemvelo.
- I-Charge Controller: Sebenzisa i-solar lithium charger eyenzelwe oko esekelwe kwi-CN3065 IC endaweni ye-TP4056 eqhelekileyo. I-CN3065 imelana nokutshintshatshintsha kwe-voltage engenayo ngaphandle kokuphazamiseka okanye ukuxinga xa ukukhanya kwelanga kwehla.
- Ukukhetha Ombane we-Sensor (Power Isolation): Qinisekisa ukuba ii-sensor ezingaphandle (ezifana nee-capacitive soil moisture probes) zifumana umbane kwiphini le-GPIO le-ESP32 endaweni yomgca we-3.3V. Yenza iphini libe ngu-HIGH kuphela ngexesha lomzuzwana oyi-4 wokulinganisa ukuze uphelise ukutsalwa kombane okuqhubekayo.
Kwizixhobo zaseklasini kunye noyilo lwe-telemetry yezolimo olusele lulungiselelwe olu hlahlo-lwabiwo-mali lwombane, jonga uyilo lwethu lwesalathiso ku-Sheen Farming Solutions okanye ujonge iimodyuli zethu ezivulelekileyo ze-telemetry ku-Sheen IoT.
