Tsiku labwino! Nkhaniyi ikuwonetsa vuto la masensa abodza, zoperewera za zida zomwe zilipo zomwe zimagwiritsa ntchito masensawa komanso njira yothetsera vutoli.
Chitsime: ali-trends.ru
Pamaso panga, zidalembedwanso za masensa abodza . Kusiyana kwamakhalidwe pakati pa masensa abodza ndi oyamba:
- Sensor, ngakhale italumikizidwa moyandikana, imayankha munjira yamphamvu ya parasitic mosatsimikizika, kamodzi pakanthawi.
- Munjira yamphamvu ya parasitic, mulingo wapamwamba umatenga nthawi yayitali kuti ubwezeretse (mutha kuyeza ndi microcontroller kapena kuwona oscillogram)
- zomwe zimagwiritsidwa ntchito pano ndizokwera kwambiri kuposa ma microamp angapo (GND ndi VCC kuchotsera, DQ kudzera pa microammeter mpaka +5 volts)
- Pambuyo pa ndondomeko yowerengera (0xF0), masensa samayankha lamulo la scratchpad (0xBE)
- Kutentha komwe kumawerengedwa kuchokera pachikapu mphamvu ikagwiritsidwa ntchito popanda lamulo loyezera kumasiyana ndi madigiri 85,0.
- Miyezo ya scratchpad pa maudindo 5 ndi 7 sizigwirizana ndi 0xFF ndi 0x10
- Kutentha (m'malo awiri oyamba a scratchpad) kuwerengedwa mutatha kuyatsa koyamba kwa sensa yopanda mphamvu popanda lamulo loyezera lomwe mwapatsidwa kale kubweza mtengo wam'mbuyo, osati 50 05 (madigiri 85.0).
Tsoka ilo, ndilibe oscilloscope, ndipo Galileosky BaseBlock Lite GPS tracker idakhala ngati benchi yoyesera.
Masensawo adagulidwa kuchokera kwa ogulitsa osiyanasiyana, ndipo gulu limodzi lokha linagwira ntchito chifukwa cha mphamvu ya parasitic. Maere 5 okha pa zidutswa 50 zomwe zidagulidwa.
Zina zonse sizinagwire ntchito chifukwa cha mphamvu ya parasitic konse. The terminal sikupereka mphamvu yakunja kwa sensa, ndipo kukhazikitsa dongosolo pagalimoto kuyenera kukhala kosavuta momwe mungathere.
Kuthetsa mavuto
Chifukwa chake, masensawo adagulidwa, koma gulu limodzi lokha linagwira ntchito moyenera, ndipo kufufuza ndi kuyitanitsa batch yatsopano kukanatenga nthawi yayitali, ndipo zikanapangitsa kuti ndalama zichuluke. Choncho, vutolo linayenera kuthetsedwa lokha.
Popeza kuti mawaya awiri okha amagwiritsidwa ntchito, m'pofunika kukonza magetsi ku sensa kuchokera ku waya wa chizindikiro, ndiko kuti, kukonza mphamvu za parasitic. Ndinapanga mphamvu za parasitic molingana ndi dongosolo ili:
Mu chiwembu ichi, ntchito ya mphamvu ya parasitic imapangidwa bwino, koma nthawi yomweyo, zimakhala zotheka kulumikiza mphamvu zakunja. Pankhaniyi, chithunzi cholumikizira chimasintha pang'ono: polumikizana ndi mphamvu ya parasitic, waya wa Vcc osagwiritsidwa ntchito.
Pambuyo pa kusonkhanitsa dera ndi kuyika pamwamba, sensayo inazindikiridwa ndi terminal yokhala ndi capacitor capacitor ya 1 Β΅F. Kuti akhazikitse kwambiri, matabwa okhala ndi ma board amphamvu a parasitic adapangidwa ndikulamulidwa:
Zosangalatsa: Opanga amatha kugwiritsa ntchito zomatira zotentha zosungunuka kapena silikoni kuti asindikize sensor. Pachiyambi choyamba, mukhoza kutenthetsa manja, kuchotsani sensa, kuyika bolodi, kubwezera kumanja ndikudzaza ndi guluu wotentha kwambiri. Chachiwiri, izi sizigwiranso ntchito, ndipo ndimayenera kugulitsa bolodi pafupi ndi sensa, ndikudzaza ndi guluu wotentha ndikuyika kutentha kwa kutentha, chifukwa chake zikuwoneka motere:
Pomaliza
Pano ndikufuna kulimbikitsa opanga zipangizo kuti aganizire mfundoyi pazinthu zawo, ndi ogulitsa kuti ayang'ane masensa asanagulitse kapena asagwirizane ndi wogulitsa ngati akupereka masensa achinyengo, ndi ogwiritsa ntchito kuunikira mutuwu mu ndemanga, makalata. kapena zopempha.
Source: www.habr.com