Fish is one of the foods that contain protein and has a high nutrient content, including minerals, vitamins, and unsaturated fats. The protein content in fish is relatively high. However, fish also contains adverse effects if it has undergone spoilage. Therefore, it is necessary to select fresh fish and non-fresh fish. Currently, fish freshness selection is still done manually by fishermen. This research builds a system that can identify freshness in mackerel which is expected to be an alternative solution in the process of selecting freshness of fish manually which takes a long time. By utilizing the TCS3200 sensor to identify the color of the fish and MQ135 to detect the smell of ammonia gas in the fish. This system uses Arduino Uno as the controller of the whole system. The results obtained from the selection process are in the form of fresh and not fresh fish that have been separated based on color and odor indicators, the data will be displayed on the LCD in the form of the accumulated weight of each fish that has been selected. The results of 30 times testing the entire system as much as 30 data obtained an accuracy value of 86.7%.

Background : Postpartum anxiety is very important to know because of the mother's lack of knowledge at this stage, because it will undergo many changes both emotional (psychologically), physical (physiological) changes and environmental (social) changes experienced by postpartum mothers. Such changes can affect the emotional instability of the mother after childbirth, which is characterized by a deep and sustained feeling of fear or worry. Continued postpartum anxiety negatively affects both mother and baby.
The anxiety rate of postpartum mothers is still a high category in various countries such as Pakistan as much as (70%), Hong Kong as much as (54%), Bangladesh as much as (29%) and Portugal as much as (18.2%) %), anxiety levels in Indonesia as much as (28.7 %) (Agustin and Septiyana, 2018).
Mindfulness therapy can be used to reduce the level of anxiety towards postpartum mothers, when a person is in a mindfulness situation, the emotional stability of postpartum mothers will be more improved, and the effect is regarding the decrease in anxiety levels (Triyono. H. G, Dwidiyanti, M. & Widyastuti, 2018). According to Oktavia (2018), defining mindfulness therapy aims to help a person in gaining awareness so that there is no reaction to what is happening (good, bad or neutral events / events) and a person is able to overcome his emotions when in a state of depression or frustration and build peace for himself.