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🇳🇱 · Revelation space · Bertrik Sikken

BT785 ← Older revision Revision as of 12:13, 11 May 2026 (2 intermediate revisions by the same user not shown) Line 238: Line 238: === Water measurement probes === === Water measurement probes === I bought this one: Tuya compatible BT785 EC meter: https://nl.aliexpress.com/i/1005007462079781.html inexpensive, focused on EC, runs on 4x LR44. Speaks the TuYa protocol (requires a secret key that you can fetch through the developer console). This is quite cumbersome: you have to register as a developer, fetch the key before time runs out and developer access is limited. Does NOT speak the universal serialport access protocol as described here: https://developer.tuya.com/en/docs/iot/tuya-cloud-universal-serial-port-access-protocol?id=K9hhi0xxtn9cb * https://nl.aliexpress.com/item/1005003784454381.html BLE-9908 Inexpensie "Yieryi" PH/EC/Temp probe with bluetooth and app, about E25,- (Uses 3x LR44 coin cell batteries) * https://nl.aliexpress.com/item/1005003784454381.html BLE-9908 Inexpensie "Yieryi" PH/EC/Temp probe with bluetooth and app, about E25,- (Uses 3x LR44 coin cell batteries) * Several different models: https://nl.aliexpress.com/item/1005007810989801.html * Several different models: https://nl.aliexpress.com/item/1005007810989801.html Line 261: Line 254: * pH sensors are almost by definition fragile and last only a limited time, so probably don't bother trying to use one at all. The pH of outdoor water might not be that interesting to measure. * pH sensors are almost by definition fragile and last only a limited time, so probably don't bother trying to use one at all. The pH of outdoor water might not be that interesting to measure. * I expect the non-TuYa meters to use an easier to handle bluetooth protocol, avoiding the need for complicated encryption with a key that can only be fetched for a limited time using a tuya developer account. * I expect the non-TuYa meters to use an easier to handle bluetooth protocol, avoiding the need for complicated encryption with a key that can only be fetched for a limited time using a tuya developer account. ==== BT785 ==== I bought this one: Tuya compatible BT785 EC meter: https://nl.aliexpress.com/i/1005007462079781.html inexpensive, focused on EC, runs on 4x LR44. Speaks the TuYa protocol (requires a secret key that you can fetch through the developer console). This is quite cumbersome: you have to register as a developer, fetch the key before time runs out and developer access is limited. Does NOT speak the universal serialport access protocol as described here: https://developer.tuya.com/en/docs/iot/tuya-cloud-universal-serial-port-access-protocol?id=K9hhi0xxtn9cb More information on this wiki: https://revspace.nl/BT785 Code: https://github.com/bertrik/bt785 ==== Cheap non-bluetooth EC/TDS ==== I got this one: https://nl.aliexpress.com/item/1005007267608479.html Tear-down on hackaday: https://hackaday.io/project/184764-ectds-temp-meter-teardown == Boat control == == Boat control ==

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Karaburan