Hello Miroslav! Thank you for the reply.
I'm happy to share my schematic. It's actually the same as Fig. 4 in the datasheet under Sec. 2.1 with the exception of /O.S (pin 3).
Per the datasheet if the thermostat capabilities are not in use this pin should be left floating. I'm not worried about that feature right now so I have left it floating. I'm using 10K pullup resistors on the SDA and SCL lines and a 1.0 μF capacitor between VDD and GND rails of my breadboard. I can draw up a proper schematic if you'd like.
I have 9v into the VIN pin of the Arduino from my benchtop power supply and the 5v out of the Arduino to the + rail of the breadboard with the - rail of breadboard to GND of the Arduino.
Starting from VIN of Arudino going up the pins:
PS+ -> Uno VIN
PS- -> Uno GND
Uno GND -> - rail of breadboard
Uno 5V -> + rail of breadboard
A2,A1,A0 are all tied to - rail of breadboard making the address 1001000 (0x48)
Here's what I'm seeing from the scope. First, the read action. Using this code:
#include <Wire.h>
void setup() {
// put your setup code here, to run once:
Wire.begin();
}
void loop() {
// put your main code here, to run repeatedly:
Wire.requestFrom(0x48, 2);
delay(5000);
}I would expect 2 bytes of data from the preset register (per the datasheet this should be register 0). You can see per the screenshot what is happening is START, ADDR, then no ACK and a RESET.
So, I thought maybe I should write the register first. Using this code:
#include <Wire.h>
void setup() {
// put your setup code here, to run once:
Wire.begin();
}
void loop() {
// put your main code here, to run repeatedly:
Wire.beginTransmission(0x48);
Wire.write(0);
Wire.endTransmission();
delay(5000);
}I am attempting to write but the same issue occurs - START, ADDR, then no ACK and a RESET.
Testing + and - rails on breadboard:
Close up of the breadboard and sensor:
As requested, 1k5:
It certainly looks cleaner but no ACK. :(
