Dear all, I follow this post for my 1st project – uploading sensor readings from Adafruit BME280 to ThingSpeak via Electron. The code can be compiled successfully and now the readings have been uploaded to ThingSpeak. However, the readings are all zeros. What do I miss here? Thanks for your hel…

You seem to be missing this before first use of your sensor if (!bme.begin()) { Serial.println("Could not find a valid BME280 sensor, check wiring!"); while (1) Particle.process(); } And why are you using software SPI and not hardware SPI via A2~A5 and this constructor? Adafruit_BME2…

Hello ScruffR: Thanks for your help. It works based on the hardware SPI. Any comments about my new modified code?? //SPI wiring #define BME_CS A2 #define BME_SCK A3 #define BME_MISO A4 #define BME_MOSI A5 Adafruit_BME280 bme(BME_CS); What is the right way to wiring BME280 based on I2C? What is…

For I2C, you'd just write Adafruit_BME280 bme; And connect SDA to D0 and SCL to D1. BTW, you wouldn't need your defines as the SPI pins also have their respective names SS, SCK, MOSI & MISO. Hardware SPI is done by the controler by use of a dedicated interface that does its job without you actua…

Hello ScruffR: Thanks again. I need to upgrade the firmware in order to use the SLEEP_NETWORK_STANDBY(). Now it works. I am going to let it run over night to compare the data usage. I will let you know how it goes. The I2C wiring is still not working based on your instruction – connecting SDA to …

You could try adding external 10k or 4k7 pull-up resistors to the D0 and D1.

I checked this also and my50 ct: I2C works with this PINs with/without resistors: // I2C wiring #define BME_MOSI D0 #define BME_SCK D1 //#define BME_SCK D4 //#define BME_MISO D3 //#define BME_MOSI D2 //#define BME_CS D5 #define SEALEVELPRESSURE_HPA (1013.25) Adafruit_BME280 bme; // I2C //Adafru…

@Postler , there are no circumstances where I2C will work without pullup resistors. With an Adafruit board or any other board, those resistors are typically on those boards.

I confirm: get the “more correct” values without additional resistances. It was primarily about the PIN assignment: here we deviate from the Libary.

SOS blinks on BME280+Electron+ThingSpeak

Troubleshooting

changks July 5, 2016, 3:12pm 7

I am about to get I2C working by adding pull-up resistors. For the wiring, is it similar to this?

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SOS blinks on BME280+Electron+ThingSpeak

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