Today I’ve been thinking little bit about the wireless sensor possibilities. My friend at work knows about BLE (Bluetooth Low Energy) technology and he was going to order a NRF51822 BLE4.0 module for he’s projects. This module uses Nordic Semiconductor’s nRF51822 chip, which is designed for ulta-low-power wireless applications. Originally I was planning to use some WiFi module like CH340, but since BLE technology consumes less power, I think it makes more sense to use BLE in my project. I’m very lazy changing batteries, so if some engineer** from Nordic Semiconductor reads this, I hope you guys have done good job since I’m also going to use your nRF51822 chip!
(** I know quite many engineers in Nordic. They are ex-colleagues from other companies)
I found this article about the BLE – WiFi comparison for IoT: https://dzone.com/articles/ble-vs-wi-fi-for-iot-product-development
NRF51822 BLE4.0 module: https://www.aliexpress.com/item/32892343351.html?spm=a2g0o.productlist.0.0.55581a1apPw2Qy&algo_pvid=ba999031-9b11-41b7-a923-792cfa11467c&algo_expid=ba999031-9b11-41b7-a923-792cfa11467c-0&btsid=278ad177-5e37-469f-ad60-f4d94f43e1aa&ws_ab_test=searchweb0_0,searchweb201602_8,searchweb201603_53
CH340 WiFi module: https://www.aliexpress.com/item/32654418046.html?spm=a2g0o.detail.100009.1.698d6b18MXHfr9&gps-id=pcDetailLeftTopSell&scm=1007.13482.95643.0&scm_id=1007.13482.95643.0&scm-url=1007.13482.95643.0&pvid=78f3a7fd-dddf-43d9-a2b9-0b215d537348
There is also commercial moisture sensor available by Xiaomi, but it cost’s more than DIY-version (Do It Yourself by connecting moisture sensor and BLE module): https://www.ebay.com/itm/Xiaomi-Plant-Tester-Light-Temperature-Soil-Moisture-Meter-Nutrition-Detector-/283447735022
That’s all about the technology for this time. Tomorrow I’ll buy chili seeds and start first plantings for this year!