Secondary school students (N = 269) participated in a daylong visual programming course held in a stimulating environment for start-up enterprises. The tasks were application-oriented and partly creative. For example, a wearable device with light-emitting diodes, (ie, LEDs) could be applied to a T-shirt and used for optical messages. Our research questions related to the control-value model of achievement emotions. We measured experienced enjoyment four times and examined the dependence of enjoyment on the individual tasks. Experience of enjoyment was also tested for the prediction of students' self-efficacy for programming. The results showed that momentary enjoyment was not significantly dependent on the task situation, but it was dependent on the general enjoyment of programming. However, students with lower enjoyment scores showed higher increases in enjoyment during the final tasks than those with higher initial scores. The emotion score of the girls increased more than those of the boys but the girls' overall enjoyment scores were lower than those of the boys. Students' self-efficacy beliefs of both genders increased over the course, and some of the differences in beliefs can be explained by the enjoyment of the course. In conclusion, our teaching approach seemed beneficial for the motivation to learn programming, particularly among girls.