I have a problem with the „Grove Beginner Kit for Arduino“.
The assembled board works fine, but after I broke out the modules, I figured out problems with the 3-Axis Accelerator and the OLED Display I2C Modules.
I have one original pre-assembled board and two disassembled boards, so I can compare the function.
All sketches work well on the pre-assemble board, but not with the disassembled parts.
- 3-Axis Accelerator
I don’t get the 3-Axis Accelerator (LIS3DHTR) to work at all after I broke out the modules. (Both two disassembled modules, so I don’t think I destroyed the boards…)
I always get the error message “LIS3DHTR didn’t connect.” from the sketch.
I also figured out that there are two versions of the LIS3DHTR Library. One with
initialisation and on with
But this is not the problem. With both libs, it works on the assembled board and not with the single modules.
- OLED Display
The original sketch use HW I2C to init the modul
U8G2_SSD1306_128X64_NONAME_1_HW_I2C u8g2(U8G2_R2, /* reset=*/U8X8_PIN_NONE);
This did not work with the single module. The single module works only with SW I2C like
U8G2_SSD1306_128X64_NONAME_F_SW_I2C u8g2(U8G2_R0, /* clock=/ SCL, / data=/ SDA, / reset=*/ U8X8_PIN_NONE)
(The software I2C works on the pre-assembled board as well)
But now to the strange part. When I connect all I2C Bords (Accelerator, Barometer and the Display) I can use the HW I2C for the Display.
I use a Arduino Uno with Grove Shield (this has 3 I2C Ports), and uploaded the simple “Hello World” sketch for the Display with HW I2C.
When I only connect the Display, this doesn’t work, and the Display keeps black. But when I also connect the other I2C modules (without modifying the sketch) the Display works.
Has anyone an idea on one or both problems? Thanks!