![]() ![]() in DTIM3, to maintain a sleep 300ms-wake 3ms cycle to receive AP’s Beacon packages, the current is about 0.9mA. Without data transmission, the Wi-Fi Modem circuit can be turned off and CPU suspended to save power according to the 802.11 standard (U-APSD).Į.g. ②:During Light-Sleep, the CPU may be suspended in applications like Wi-Fi switch. in DTIM3, to maintain a sleep 300ms-wake 3ms cycle to receive AP’s Beacon packages, the current is about 15mA. According to 802.11 standards (like U-APSD), it saves power to shut down the Wi-Fi Modem circuit while maintaining a Wi-Fi connection with no data transmission.Į.g. ①:Modem-Sleep requires the CPU to be working, as in PWM or I2S applications. I found the folling on the Espressif Website:Ĭurrently ESP8266 can support three low power modes: Light Sleep, Modem Sleep and Deep Sleep. If( ESP.Is there a sleep mode, which keeps the wifi running, but the ESP8266 should still be able to receive a packet (maybe an interrupt? Try to read WiFi settings from RTC memory WiFi.mode( WIFI_OFF ) //required? we start with rf disabled ? ![]() we disable WiFi, coming from DeepSleep, as we do not need it right away IPAddress subnet( 255, 255, 255, 0 ) // may be different for your network (but this one is pretty standard)ĭigitalWrite(LED_BUILTIN, HIGH) //That means LED off. ![]() IPAddress gateway( 192, 168, 1, 254 ) // may be different for your network IPAddress ip( 192, 168, 1, 12 ) // pick your own suitable static IP address Uint8_t index_count // 1 byte, 12 in total so the RTC data structure should be padded to a 4-byte multiple. The access methods read and write 4 bytes at a time, The ESP8266 RTC memory is arranged into blocks of 4 bytes. We make a structure to store connection information Temperature wire is plugged into port D5 on the ESP8266 (GPIO 14) Unsigned long m圜hannelNumber = SECRET_CH_ID Ĭonst char * myWriteAPIKey = SECRET_WRITE_APIKEY Ĭhar* WLAN_SSID = SECRET_SSID // your network SSID (name)Ĭhar* WLAN_PASSWD = SECRET_PASS // your network password No reading of sensors, only radio on/off What happens if radio is switched on every xx times? The nr of times it will cycle through deepsleep before turning on WIFI. ![]() Where I put the arrow <-in the code try putting 0 and then e.g 2. (Code may have some redundant lines, I copied them from my main program) Maybe someone can shed a light on this issue. But when I come from deepsleep and cycle one or more times without switching on the WIFI it looses the ability to quick connect. Again this 'bug' appears! So when coming from deepsleep and start the WIFI every time, a quick connection is made. Once I cycle throught the code without switching on the WIFI it won't quick connect anymore. I tried several things, put in delays after some RF commands, tried WIFI_off and other goto sleep commands but nothing worked sofar.Īnd the strange thing is that when I switch on the WIFI every measurement it will quick connect. It needs to get the ,already known, info again and that takes about 10 secs to complete. However, and here is the issue, -sorry for the long introduction- the quick connection 'trick' is not working anymore. So I stayed up one night and programmed a new setup. What if I store -say- 12 measurements (conveniently 1 hour of data) in the rtcMemory and upload it only once an hour? The 'on' time per measurement would drastically go down (I measured ca 250msec) and the powerhungry RF radio would be on for only 1.3 secs once an hour. It is only 'on' for some 1.3 secs every measurement. My setup reads a temp-sensor every 5 minutes (along with battery Voltage and the time the ESP is awake) and sends it to Thingspeak. Here's a sample code I used and adapted for my needs: WiFi.begin( WLAN_SSID, WLAN_PASSWD, rtcData.channel, rtcData.ap_mac, true ) I will not go into detail, but one of the 'tricks' involved is putting the deepsleep in the RF disabled mode, so that when it returns from deepsleep the RF is initially not enabled.ĮSP.deepSleep( SLEEPTIME, WAKE_RF_DISABLED ) įurther I use static IP and the rtcMemory to store the MAC address and WIFI channel as to invoke a quick WIFI connection. It runs on a 3.7V Li-ion 200mAh for ca 20 days. Found some interesting articles and managed to program an ESP8266 with a temp sensor that updates every 5 mins to Thingspeak. A while ago I researched the battery-powered options for ESP8266. ![]()
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