Inlet and SoC Temperature Comparison

Core Temperature Monitoring

The Core temperature is monitored in two ways:

• Reading the “system on a chip”, or SoC processor’s own temperature
• Reading the temperature sensor at the “inlet” position on the PCB

The temperatures are being read and saved every minute.

colnames <- c("DateTime", "SoCTemp", "InletTemp", "InletRH")
temps <- read.csv("environ_data.log-20180901", header = FALSE, sep = " ", col.names = colnames )
temps$DateTime <- as.POSIXct(strptime(temps$DateTime, "%FT%T"))

This plot shows the data over time from the two sources for core1060. The inlet temperature sensor appears to be affected by the heat generated by the PCB (power circuit?) so that it is not in any way a true reading of the room environment. In general the inlet reading is higher than the SoC reading.

df <- temps %>%
  select(DateTime, SoCTemp, InletTemp) %>%
  gather(key = "source", value = "temp", -DateTime)
ggplot(df, aes(x = DateTime, y = temp)) + 
  geom_point(aes(color = source), size = 0.1) +
  scale_color_manual(values = c("#00AFBB", "#E7B800")) +
  theme_minimal() +
  labs(y="Temp(degC)", x="DateTime")