I'm new to this forum and a new to the ESP8266.
I've been trying to get my ESP8266 Thing to go into very low power mode. Seems quite straightforward, but I noticed that it only stayed at 78 uA for a moment before jumping to a steady 540 uA. See link below. Has anyone else experienced this before? It's as though a peripheral is suddenly switching on. I couldn't find much in the way of documentation, so debugging is very difficult. Any help would be much appreciated.
#include <Ticker.h> // Ticker can periodically call a function
Ticker blinker; // Ticker object called blinker.
int ledPin = 5; // LED is attached to ESP8266 pin 5.
uint8_t ledStatus = 0; // Flag to keep track of LED on/off status
int counter = 0; // Count how many times we've blinked
pinMode(ledPin, OUTPUT); // Set LED pin (5) as an output
blinker.attach(0.25, blink); // Ticker on blink function, call every 250ms
ledStatus = (ledStatus + 1) % 2; // Flip ledStatus
if (counter++ > 20) // If we've blinked 20 times
ESP.deepSleep(60000000, WAKE_RF_DEFAULT); // Sleep for 60 seconds