diff --git a/Snakefile b/Snakefile
index 069466c6..4d64cfc6 100644
--- a/Snakefile
+++ b/Snakefile
@@ -8,6 +8,7 @@ rule all:
         expand("data/raw/{pid}/{sensor}_raw.csv", pid=config["PIDS"], sensor=config["SENSORS"]),
         expand("data/raw/{pid}/{sensor}_with_datetime.csv", pid=config["PIDS"], sensor=config["SENSORS"]),
         expand("data/processed/{pid}/battery_deltas.csv", pid=config["PIDS"]),
+        expand("data/interim/{pid}/phone_valid_sensed_days.csv", pid=config["PIDS"]),
         expand("data/processed/{pid}/com_sms_{sms_type}_{day_segment}_{metric}.csv",
                             pid=config["PIDS"],
                             sms_type = config["COM_SMS"]["SMS_TYPES"],
diff --git a/config.yaml b/config.yaml
index 5b574029..66b251b8 100644
--- a/config.yaml
+++ b/config.yaml
@@ -1,5 +1,5 @@
 # Valid database table names
-SENSORS: [messages, calls, battery, screen]
+SENSORS: [applications_crashes, applications_foreground, applications_notifications, battery, bluetooth, calls, locations, messages, plugin_ambient_noise, plugin_device_usage, plugin_google_activity_recognition, screen]
 
 # Participants to include in the analysis
 # You must create a file for each participant
@@ -31,4 +31,9 @@ COM_CALL:
   CALL_TYPE_TAKEN : [incoming, outgoing]
   DAY_SEGMENTS: *day_segments
   METRICS_MISSED: [count, distinctcontacts]
-  METRICS_TAKEN: [count, distinctcontacts, meanduration, sumduration, hubermduration, varqnduration, entropyduration]
\ No newline at end of file
+  METRICS_TAKEN: [count, distinctcontacts, meanduration, sumduration, hubermduration, varqnduration, entropyduration]
+
+PHONE_VALID_SENSED_DAYS:
+  BIN_SIZE: 5 # (in minutes)
+  MIN_VALID_HOURS: 20 # (out of 24)
+  MIN_BINS_PER_HOUR: 8 # (out of 60min/BIN_SIZE bins)
\ No newline at end of file
diff --git a/rules/preprocessing.snakefile b/rules/preprocessing.snakefile
index 987a8dad..20b92301 100644
--- a/rules/preprocessing.snakefile
+++ b/rules/preprocessing.snakefile
@@ -18,4 +18,16 @@ rule readable_datetime:
     output:
         "data/raw/{pid}/{sensor}_with_datetime.csv"
     script:
-        "../src/data/readable_datetime.R"
\ No newline at end of file
+        "../src/data/readable_datetime.R"
+
+rule phone_valid_sensed_days:
+    input:
+        all_sensors =  expand("data/raw/{{pid}}/{sensor}_with_datetime.csv", sensor=config["SENSORS"])
+    params:
+        bin_size = config["PHONE_VALID_SENSED_DAYS"]["BIN_SIZE"],
+        min_valid_hours = config["PHONE_VALID_SENSED_DAYS"]["MIN_VALID_HOURS"],
+        min_bins_per_hour = config["PHONE_VALID_SENSED_DAYS"]["MIN_BINS_PER_HOUR"]
+    output:
+        "data/interim/{pid}/phone_valid_sensed_days.csv"
+    script:
+        "../src/data/phone_valid_sensed_days.R"
\ No newline at end of file
diff --git a/src/data/phone_valid_sensed_days.R b/src/data/phone_valid_sensed_days.R
new file mode 100644
index 00000000..f76541bc
--- /dev/null
+++ b/src/data/phone_valid_sensed_days.R
@@ -0,0 +1,31 @@
+source("packrat/init.R")
+
+library(dplyr)
+
+all_sensors <- snakemake@input[["all_sensors"]]
+bin_size <- snakemake@params[["bin_size"]]
+min_valid_hours <- snakemake@params[["min_valid_hours"]]
+min_bins_per_hour <- snakemake@params[["min_bins_per_hour"]]
+output_file <- snakemake@output[[1]]
+
+# Load all sensors and extract timestamps
+all_sensor_data <- data.frame(timestamp = c())
+for(sensor in all_sensors){
+    sensor_data <- read.csv(sensor, stringsAsFactors = F) %>% select(local_date, local_hour, local_minute)
+    all_sensor_data <- rbind(all_sensor_data, sensor_data)
+}
+
+phone_valid_sensed_days <- all_sensor_data %>% 
+    mutate(bin = (local_minute %/% bin_size) * bin_size) %>% # bin rows into bin_size-minute bins
+    group_by(local_date, local_hour, bin) %>% 
+    summarise(minute_period = first(bin)) %>% #filter repeated bins (if rows were logged within bin_size minutes)
+    ungroup() %>% 
+    group_by(local_date, local_hour) %>% 
+    summarise(bins = n()) %>% # Count how many bins there are per hour
+    ungroup() %>% 
+    filter(bins >= min_bins_per_hour) %>% # Discard those hours where there were fewer than min_bins_per_hour
+    group_by(local_date) %>% 
+    summarise(valid_hours = n()) %>% # Count how many valid hours each day has
+    filter(valid_hours >= min_valid_hours) # Discard those days where there were fewer than min_valid_hours
+
+write.csv(phone_valid_sensed_days, output_file)